apa.bst

% BibTeX `apa' style
%	for BibTeX version 0.99a
%	by David Plaut (dcp) 17jan91
%
% This BibTeX style has support for short (year only) citations.  This
% is done by having the citations actually look like
%         \citename{name-info}{year}
% see apa.sty for usage.
%
% Modified from:
% BibTeX `apalike' bibliography style (24-Jan-88 version)
% Adapted from the `alpha' style, version 0.99a; for BibTeX version 0.99a.
% Copyright (C) 1988, all rights reserved.
% Copying of this file is allowed, provided that if you make any changes at all
% you name it something other than `apalike.bst'.
% This restriction helps ensure that all copies are identical.
% Differences between this style and `alpha' are generally heralded by a `%'.
% The file btxbst.doc has the documentation for alpha.bst.
%
% This style should be used with the `apalike' LaTeX style (apalike.sty).
% \cite's come out like "(Jones, 1986)" in the text but there are no labels
% in the bibliography, and something like "(1986)" comes out immediately
% after the author.  Author (and editor) names appear as last name, comma,
% initials.  A `year' field is required for every entry, and so is either
% an author (or in some cases, an editor) field or a key field.
%
% History:
%   15-sep-86	(SK,OP)	Original version, by Susan King and Oren Patashnik.
%   10-nov-86	(OP)	Truncated the sort.key$ string to the correct length
%			in bib.sort.order to eliminate error message.
%   24-jan-88	(OP)	Updated for BibTeX version 0.99a, from alpha.bst 0.99a;
%			apalike now sorts by author, then year, then title;
%			THIS `apalike' VERSION DOES NOT WORK WITH BIBTEX 0.98i.

ENTRY
  { address
    author
    booktitle
    chapter
    edition
    editor
    howpublished
    institution
    journal
    key
%    month		not used in apalike
    month		% yes is is, for unpublished and inproceedings
    note
    number
    organization
    pages
    publisher
    school
    series
    title
    type
    volume
    year
  }
  {}
  { label long.label extra.label sort.label }

INTEGERS { output.state before.all mid.sentence after.sentence after.block }

FUNCTION {init.state.consts}
{ #0 'before.all :=
  #1 'mid.sentence :=
  #2 'after.sentence :=
  #3 'after.block :=
}

STRINGS { s t }

FUNCTION {output.nonnull}
{ 's :=
  output.state mid.sentence =
    { ", " * write$ }
    { output.state after.block =
	{ add.period$ write$
	  newline$
	  "\newblock " write$
	}
	{ output.state before.all =
	    'write$
	    { add.period$ " " * write$ }
	  if$
	}
      if$
      mid.sentence 'output.state :=
    }
  if$
  s
}

FUNCTION {pub.output.nonnull}
{ 's :=
  output.state mid.sentence =
    { ": " * write$ }
    { output.state after.block =
	{ add.period$ write$
	  newline$
	  "\newblock " write$
	}
	{ output.state before.all =
	    'write$
	    { add.period$ " " * write$ }
	  if$
	}
      if$
      mid.sentence 'output.state :=
    }
  if$
  s
}

FUNCTION {output}
{ duplicate$ empty$
    'pop$
    'output.nonnull
  if$
}

FUNCTION {pub.output}
{ duplicate$ empty$
    'pop$
    'pub.output.nonnull
  if$
}

FUNCTION {output.check}
{ 't :=
  duplicate$ empty$
    { pop$ "empty " t * " in " * cite$ * warning$ }
    'output.nonnull
  if$
}

FUNCTION {pub.output.check}
{ 't :=
  duplicate$ empty$
    { pop$ "empty " t * " in " * cite$ * warning$ }
    'pub.output.nonnull
  if$
}

%					apalike needs this function because
%					the year has special punctuation;
%					apalike ignores the month


FUNCTION {not}
{   { #0 }
    { #1 }
  if$
}

FUNCTION {and}
{   'skip$
    { pop$ #0 }
  if$
}
FUNCTION {or}
{   { pop$ #1 }
    'skip$
  if$
}

FUNCTION {extra.label.dash}
{ year empty$ extra.label "" = or
  { extra.label }
  { year "in press" = year "in preparation" = or year "submitted" = or
    { "-" extra.label * }
    { extra.label }
    if$
  }
  if$
}

FUNCTION {output.year.check}
{ year empty$
    { "empty year in " cite$ * warning$ }
    { write$
      " (" year * extra.label.dash * ")" *
      mid.sentence 'output.state :=
    }
  if$
}

FUNCTION {format.month}
{ month empty$
    { "" }
    { ", " * month "t" change.case$ }
  if$
}

FUNCTION {output.year.month.check}
{ year empty$
    { "empty year in " cite$ * warning$ }
    { write$
      " (" year * extra.label.dash * format.month * ")" *
      mid.sentence 'output.state :=
    }
  if$
}

FUNCTION {output.bibitem}
{ newline$
  "\bibitem[" write$
  long.label write$
  label write$
  "}{"  write$			% add cite to citation arguments
  cite$ write$
  "}]{" write$			% added "}" 16jan91 (dcp)
  cite$ write$
  "}" write$
  newline$
  ""
  before.all 'output.state :=
}

FUNCTION {fin.entry}
{ add.period$
  write$
  newline$
}

FUNCTION {new.block}
{ output.state before.all =
    'skip$
    { after.block 'output.state := }
  if$
}

FUNCTION {new.sentence}
{ output.state after.block =
    'skip$
    { output.state before.all =
	'skip$
	{ after.sentence 'output.state := }
      if$
    }
  if$
}

FUNCTION {new.block.checkb}
{ empty$
  swap$ empty$
  and
    'skip$
    'new.block
  if$
}

FUNCTION {field.or.null}
{ duplicate$ empty$
    { pop$ "" }
    'skip$
  if$
}

FUNCTION {emphasize}
{ duplicate$ empty$
    { pop$ "" }
    { "{\em " swap$ * "}" * }
  if$
}

INTEGERS { nameptr namesleft numnames }

FUNCTION {format.names}
{ 's :=
  #1 'nameptr :=
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    { s nameptr "{vv~}{ll}{, jj}{, f.}" format.name$ 't :=   % last name first
      nameptr #1 >
	{ namesleft #1 >
	    { ", " * t * }
%	    { numnames #2 >
	    { numnames #1 >
		{ "," * }
		'skip$
	      if$
	      t "others" =
		{ " et~al." * }
		{ " \& " * t * }
	      if$
	    }
	  if$
	}
	't
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {format.ed.names}
{ 's :=
  #1 'nameptr :=
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    { s nameptr "{f. }{jj,}{vv~}{ll}" format.name$ 't :=   % first name first
%    { s nameptr "{vv~}{ll}{, jj}{, f.}" format.name$ 't :=   % last name first
      nameptr #1 >
	{ namesleft #1 >
	    { ", " * t * }
%	    { numnames #2 >
	    { numnames #1 >
		{ "," * }
		'skip$
	      if$
	      t "others" =
		{ " et~al." * }
		{ " \& " * t * }
	      if$
	    }
	  if$
	}
	't
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {format.authors}
{ author empty$
    { "" }
    { author format.names }
  if$
}

FUNCTION {format.key}			% this function is just for apalike
{ empty$
    { key field.or.null }
    { "" }
  if$
}

FUNCTION {format.editors}
{ editor empty$
    { "" }
    { editor format.ed.names
      editor num.names$ #1 >
	{ " (Eds.)" * }
	{ " (Ed.)" * }
      if$
    }
  if$
}

FUNCTION {format.book.editors}
{ editor empty$
    { "" }
    { editor format.names
      editor num.names$ #1 >
	{ " (Eds.)." * }
	{ " (Ed.)." * }
      if$
    }
  if$
}

FUNCTION {format.title}
{ title empty$
    { "" }
    { title "t" change.case$ }
  if$
}

FUNCTION {n.dashify}
{ 't :=
  ""
    { t empty$ not }
    { t #1 #1 substring$ "-" =
	{ t #1 #2 substring$ "--" = not
	    { "--" *
	      t #2 global.max$ substring$ 't :=
	    }
	    {   { t #1 #1 substring$ "-" = }
		{ "-" *
		  t #2 global.max$ substring$ 't :=
		}
	      while$
	    }
	  if$
	}
	{ t #1 #1 substring$ *
	  t #2 global.max$ substring$ 't :=
	}
      if$
    }
  while$
}

FUNCTION {format.btitle}
{ title "t" change.case$ emphasize
}

FUNCTION {tie.or.space.connect}
{ duplicate$ text.length$ #3 <
    { "~" }
    { " " }
  if$
  swap$ * *
}

FUNCTION {either.or.check}
{ empty$
    'pop$
    { "can't use both " swap$ * " fields in " * cite$ * warning$ }
  if$
}

FUNCTION {format.bvolume}
{ volume empty$
    { "" }
    { "Vol." volume tie.or.space.connect
      series empty$
	'skip$
	{ " of " * series emphasize * }
      if$
      "volume and number" number either.or.check
    }
  if$
}

FUNCTION {format.number.series}
{ volume empty$
    { number empty$
	{ series field.or.null }
	{ output.state mid.sentence =
	    { "no." }
	    { "No." }
	  if$
	  number tie.or.space.connect
	  series empty$
	    { "there's a number but no series in " cite$ * warning$ }
	    { " in " * series * }
	  if$
	}
      if$
    }
    { "" }
  if$
}

FUNCTION {format.edition}
{ edition empty$
    { "" }
    { output.state mid.sentence =
	{ edition "l" change.case$ " edition" * }
	{ edition "t" change.case$ " edition" * }
      if$
    }
  if$
}

INTEGERS { multiresult }

FUNCTION {multi.page.check}
{ 't :=
  #0 'multiresult :=
    { multiresult not
      t empty$ not
      and
    }
    { t #1 #1 substring$
      duplicate$ "-" =
      swap$ duplicate$ "," =
      swap$ "+" =
      or or
	{ #1 'multiresult := }
	{ t #2 global.max$ substring$ 't := }
      if$
    }
  while$
  multiresult
}

FUNCTION {format.pages}
{ pages empty$
    { "" }
    { pages multi.page.check
	{ pages n.dashify }
	{ pages }
      if$
    }
  if$
}

FUNCTION {format.long.pages}
{ pages empty$
    { "" }
    { pages multi.page.check
	{ "pp.\" pages n.dashify tie.or.space.connect }
	{ "p." pages tie.or.space.connect }
      if$
    }
  if$
}

FUNCTION {format.vol.num.pages}
{ volume empty$
  { "" }
  { volume "\/" * emphasize }
  if$
  number empty$
    'skip$
    { "(" number * ")" * *
      volume empty$
	{ "there's a number but no volume in " cite$ * warning$ }
	'skip$
      if$
    }
  if$
  pages empty$
    'skip$
    { duplicate$ empty$
	{ pop$ format.pages }
	{ ", " * pages n.dashify * }
%	{ ":" * pages n.dashify * }
      if$
    }
  if$
}

FUNCTION {format.chapter.pages}
{ chapter empty$
    'format.long.pages
    { type empty$
	{ "Chap." }
	{ type "l" change.case$ }
      if$
      chapter tie.or.space.connect
      pages empty$
	'skip$
	{ ", " * format.long.pages * }
      if$
    }
  if$
}

FUNCTION {output.chapter.pages.check}
{ pages empty$ chapter empty$ and
  { }
%dcp
%  { write$ ", " format.chapter.pages * }
  { write$ " (" format.chapter.pages * ")" * }
  mid.sentence 'output.state :=
  if$
}

FUNCTION {format.in.ed.booktitle}
{ booktitle empty$
    { "" }
    { editor empty$
	{ "In " booktitle "t" change.case$ emphasize * }
	{ "In " format.editors * ", " * booktitle "t" change.case$ emphasize * }
      if$
    }
  if$
}

FUNCTION {format.proceedings.title}
{ booktitle empty$
    { "" }
    { editor empty$
%	{ "In " booktitle emphasize * }
	{ booktitle emphasize }
	{ "In " format.editors * ", " * booktitle emphasize * }
      if$
    }
  if$
}

FUNCTION {format.thesis.type}
{ type empty$
    'skip$
    { pop$
      type "t" change.case$
    }
  if$
}

FUNCTION {format.tr.number}
{ type empty$
    { "Technical Report" }
    'type
  if$
  number empty$
    { "t" change.case$ }
    { number tie.or.space.connect }
  if$
}

FUNCTION {output.tr.number}
{ write$
  " (" format.tr.number * ")" *
  mid.sentence 'output.state :=
}

FUNCTION {format.article.crossref}
{ "In"							% this is for apalike
  " \cite{" * crossref * "}" *
}

FUNCTION {format.book.crossref}
{ volume empty$
    { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
      "In "
    }
    { "Volume" volume tie.or.space.connect
      " of " *
    }
  if$
  "\cite{" * crossref * "}" *				% this is for apalike
}

FUNCTION {format.incoll.inproc.crossref}
{ "In"							% this is for apalike
  " \cite{" * crossref * "}" *
}

FUNCTION {article}
{ output.bibitem
  format.authors "author" output.check
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.title "title" output.check
  new.block
  crossref missing$
    { journal emphasize "journal" output.check
      format.vol.num.pages output
    }
    { format.article.crossref output.nonnull
      format.pages output
    }
  if$
  new.block
  note output
  fin.entry
}

FUNCTION {book}
{ output.bibitem
  author empty$
    { format.book.editors "author and editor" output.check
      editor format.key output
    }
    { format.authors output.nonnull
      crossref missing$
	{ "author and editor" editor either.or.check }
	'skip$
      if$
    }
  if$
  output.year.check				% special for apalike
  new.block
  format.btitle "title" output.check
  crossref missing$
    { format.bvolume output
      new.block
      format.number.series output
      new.sentence
      address "address" output.check
      publisher "publisher" pub.output.check
    }
    { new.block
      format.book.crossref output.nonnull
    }
  if$
  format.edition output
  new.block
  note output
  fin.entry
}

FUNCTION {booklet}
{ output.bibitem
  format.authors output
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.title "title" output.check
  new.block
  howpublished output
  address output
  new.block
  note output
  fin.entry
}

FUNCTION {inbook}
{ output.bibitem
  author empty$
    { format.book.editors "author and editor" output.check
      editor format.key output
    }
    { format.authors output.nonnull
      crossref missing$
	{ "author and editor" editor either.or.check }
	'skip$
      if$
    }
  if$
  output.year.check				% special for apalike
  new.block
  format.btitle "title" output.check
  crossref missing$
    { format.bvolume output
      format.chapter.pages "chapter and pages" output.check
      new.block
      format.number.series output
      new.sentence
      address "address" output.check
      publisher "publisher" pub.output.check
    }
    { format.chapter.pages "chapter and pages" output.check
      new.block
      format.book.crossref output.nonnull
    }
  if$
  format.edition output
  new.block
  note output
  fin.entry
}

FUNCTION {incollection}
{ output.bibitem
  format.authors "author" output.check
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.title "title" output.check
  new.block
  crossref missing$
    { format.in.ed.booktitle "booktitle" output.check
      format.bvolume output
      format.number.series output
      output.chapter.pages.check
      new.sentence
      address "address" output.check
      publisher "publisher" pub.output.check
      format.edition output
    }
    { format.incoll.inproc.crossref output.nonnull
      format.chapter.pages output
    }
  if$
  new.block
  note output
  fin.entry
}

FUNCTION {inproceedings}
{ output.bibitem
  format.authors "author" output.check
  author format.key output				% special for
  output.year.month.check				% apalike
  new.block
  format.title "title" output.check
  new.block
  crossref missing$
    { format.proceedings.title "booktitle" output.check
      format.bvolume output
      format.number.series output
      output.chapter.pages.check
      new.sentence					% there's no year
      organization output				% here so things
      address "address" output.check
      publisher pub.output					% are simpler
    }
    { format.incoll.inproc.crossref output.nonnull
      format.pages output
    }
  if$
  new.block
  note output
  fin.entry
}

FUNCTION {conference} { inproceedings }

FUNCTION {manual}
{ output.bibitem
  format.authors output
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.btitle "title" output.check
  organization address new.block.checkb
  organization output
  address output
  format.edition output
  new.block
  note output
  fin.entry
}

FUNCTION {mastersthesis}
{ output.bibitem
  format.authors "author" output.check
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.title "title" output.check
  new.block
  "Master's thesis" format.thesis.type output.nonnull
  school "school" output.check
  address output
  new.block
  note output
  fin.entry
}

FUNCTION {misc}
{ output.bibitem
  format.authors output
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.title output
  new.block
  howpublished output
  new.block
  note output
  fin.entry
}

FUNCTION {phdthesis}
{ output.bibitem
  format.authors "author" output.check
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.btitle "title" output.check
  new.block
  "PhD thesis" format.thesis.type output.nonnull
  school "school" output.check
  address output
  new.block
  note output
  fin.entry
}

FUNCTION {proceedings}
{ output.bibitem
  format.book.editors output
  editor format.key output				% special for
  output.year.check					% apalike
  new.block
  format.btitle "title" output.check
  format.bvolume output
  format.number.series output
  address output				% for apalike
  new.sentence					% we always output
  organization output				% a nonempty organization
  publisher output				% here
  new.block
  note output
  fin.entry
}

FUNCTION {techreport}
{ output.bibitem
  format.authors "author" output.check
  author format.key output				% special for
  output.year.check					% apalike
  new.block
  format.btitle "title" output.check
  output.tr.number
  new.block
  address "address" output.check
  institution "institution" pub.output.check
  new.block
  note output
  fin.entry
}

FUNCTION {unpublished}
{ output.bibitem
  format.authors "author" output.check
  author format.key output				% special for
  output.year.month.check				% apalike
%  output.year.check					% apalike
  new.block
  format.btitle "title" output.check
  new.block
  note "note" output.check
  fin.entry
}

FUNCTION {default.type} { misc }

MACRO {jan} {"January"}

MACRO {feb} {"February"}

MACRO {mar} {"March"}

MACRO {apr} {"April"}

MACRO {may} {"May"}

MACRO {jun} {"June"}

MACRO {jul} {"July"}

MACRO {aug} {"August"}

MACRO {sep} {"September"}

MACRO {oct} {"October"}

MACRO {nov} {"November"}

MACRO {dec} {"December"}

MACRO {acmcs} {"ACM Computing Surveys"}

MACRO {acta} {"Acta Informatica"}

MACRO {cacm} {"Communications of the ACM"}

MACRO {ibmjrd} {"IBM Journal of Research and Development"}

MACRO {ibmsj} {"IBM Systems Journal"}

MACRO {ieeese} {"IEEE Transactions on Software Engineering"}

MACRO {ieeetc} {"IEEE Transactions on Computers"}

MACRO {ieeetcad}
 {"IEEE Transactions on Computer-Aided Design of Integrated Circuits"}

MACRO {ipl} {"Information Processing Letters"}

MACRO {jacm} {"Journal of the ACM"}

MACRO {jcss} {"Journal of Computer and System Sciences"}

MACRO {scp} {"Science of Computer Programming"}

MACRO {sicomp} {"SIAM Journal on Computing"}

MACRO {tocs} {"ACM Transactions on Computer Systems"}

MACRO {tods} {"ACM Transactions on Database Systems"}

MACRO {tog} {"ACM Transactions on Graphics"}

MACRO {toms} {"ACM Transactions on Mathematical Software"}

MACRO {toois} {"ACM Transactions on Office Information Systems"}

MACRO {toplas} {"ACM Transactions on Programming Languages and Systems"}

MACRO {tcs} {"Theoretical Computer Science"}

READ

FUNCTION {sortify}
{ purify$
  "l" change.case$
}

INTEGERS { len }

FUNCTION {chop.word}
{ 's :=
  'len :=
  s #1 len substring$ =
    { s len #1 + global.max$ substring$ }
    's
  if$
}

%			There are three apalike cases: one person (Jones),
%			two (Jones and de~Bruijn), and more (Jones et~al.).
%			This function is much like format.crossref.editors.
%
%
% THIS LABEL IS ONLY FOR SORTING NOW	(dcp 1dec93)
%
FUNCTION {format.lab.names}
{ 's :=
  s #1 "{vv~}{ll}" format.name$
  s num.names$ duplicate$
  #2 >
    { pop$ "ETAL" * }
    { #2 <
	'skip$
	{ s #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
	    { "ETAL" * }
	    { "-" * s #2 "{vv~}{ll}" format.name$ * }
	  if$
	}
      if$
    }
  if$
}

FUNCTION {format.lab.firstname}
{ 's :=
  s #1 "{vv~}{ll}" format.name$
}
FUNCTION {format.lab.middlenames}
{ 's :=
  s num.names$ #2 >
    { #1 'nameptr :=
      s num.names$ 'numnames :=
      nameptr #1 + 'nameptr :=
      numnames #1 - 'numnames :=
      numnames 'namesleft :=
        { namesleft #1 > }
        { s nameptr "{vv~}{ll}" format.name$ 't :=
        nameptr #2 >
	  { ", " * t * }
    	  't
        if$
        nameptr #1 + 'nameptr :=
        namesleft #1 - 'namesleft :=
        }
      while$
    }
    { "" }
  if$
}
FUNCTION {format.lab.lastname}
{ 's :=
  s num.names$ #1 >
    { #1 'nameptr :=
      s num.names$ 'numnames :=
      numnames 'namesleft :=
        { namesleft #1 > }
        {
          nameptr #1 + 'nameptr :=
          namesleft #1 - 'namesleft :=
        }
      while$
      s nameptr "{vv~}{ll}" format.name$
    }
    { "" }
  if$
}


FUNCTION {author.key.label}
{ author empty$
    { key empty$
	{ cite$ #1 #3 substring$ }
	'key					% apalike uses the whole key
      if$
    }
    { author format.lab.names }
  if$
}
FUNCTION {author.key.longlabel}
{ author empty$
    { key empty$
	{ cite$ #1 #3 substring$ }
	'key					% apalike uses the whole key
      if$
    }
    { author format.lab.firstname     "}{" *
      author format.lab.middlenames * "}{" *
      author format.lab.lastname    * 
    }
  if$
}

FUNCTION {author.editor.key.label}
{ author empty$
    { editor empty$
	{ key empty$
	    { cite$ #1 #3 substring$ }
	    'key				% apalike uses the whole key
	  if$
	}
	{ editor format.lab.names }
      if$
    }
    { author format.lab.names }
  if$
}
FUNCTION {author.editor.key.longlabel}
{ author empty$
    { editor empty$
	{ key empty$
	    { cite$ #1 #3 substring$ }
	    'key				% apalike uses the whole key
	  if$
	}
	{ editor format.lab.firstname     "}{" *
	  editor format.lab.middlenames * "}{" *
	  editor format.lab.lastname    *
        }
      if$
    }
    { author format.lab.firstname     "}{" *
      author format.lab.middlenames * "}{" *
      author format.lab.lastname    *
    }
  if$
}

FUNCTION {editor.key.label}
{ editor empty$
    { key empty$
	{ cite$ #1 #3 substring$ }
	'key			% apalike uses the whole key, no organization
      if$
    }
    { editor format.lab.names }
  if$
}
FUNCTION {editor.key.longlabel}
{ editor empty$
    { key empty$
	{ cite$ #1 #3 substring$ }
	'key			% apalike uses the whole key, no organization
      if$
    }
    { editor format.lab.firstname     "}{" * 
      editor format.lab.middlenames * "}{" * 
      editor format.lab.lastname    *
    }
  if$
}

FUNCTION {calc.label}
{ "\protect\citename{"
  type$ "book" =
  type$ "inbook" =
  or
    'author.editor.key.longlabel
    { type$ "proceedings" =
	'editor.key.longlabel			% apalike ignores organization
	'author.key.longlabel			% for labeling and sorting
      if$
    }
  if$
  *
  "}{"	%16jan91 (dcp)					% these three lines are
%  *							% for apalike, which
%  year field.or.null purify$ #-1 #4 substring$		% uses all four digits
%  year field.or.null purify$	%2oct91 (dcp)		% uses entire year
  *
  'long.label :=
  type$ "book" =
  type$ "inbook" =
  or
    'author.editor.key.label
    { type$ "proceedings" =
	'editor.key.label			% apalike ignores organization
	'author.key.label			% for labeling and sorting
      if$
    }
  if$
  "}{"	%16jan91 (dcp)					% these three lines are
  *							% for apalike, which
%  year field.or.null purify$ #-1 #4 substring$		% uses all four digits
  year field.or.null purify$	%2oct91 (dcp)		% uses entire year
  *
  'label :=
}

FUNCTION {sort.format.names}
{ 's :=
  #1 'nameptr :=
  ""
  s num.names$ 'numnames :=
  numnames 'namesleft :=
    { namesleft #0 > }
    { nameptr #1 >
	{ "   " * }
	'skip$
      if$						% apalike uses initials
      s nameptr "{vv{ } }{ll{ }}{  f{ }}{  jj{ }}" format.name$ 't := % <= here
      nameptr numnames = t "others" = and
	{ "et al" * }
	{ t sortify * }
      if$
      nameptr #1 + 'nameptr :=
      namesleft #1 - 'namesleft :=
    }
  while$
}

FUNCTION {sort.format.title}
{ 't :=
  "A " #2
    "An " #3
      "The " #4 t chop.word
    chop.word
  chop.word
  sortify
  #1 global.max$ substring$
}

FUNCTION {author.sort}
{ author empty$
    { key empty$
	{ "to sort, need author or key in " cite$ * warning$
	  ""
	}
	{ key sortify }
      if$
    }
    { author sort.format.names }
  if$
}

FUNCTION {author.editor.sort}
{ author empty$
    { editor empty$
	{ key empty$
	    { "to sort, need author, editor, or key in " cite$ * warning$
	      ""
	    }
	    { key sortify }
	  if$
	}
	{ editor sort.format.names }
      if$
    }
    { author sort.format.names }
  if$
}

FUNCTION {editor.sort}
{ editor empty$
    { key empty$
	{ "to sort, need editor or key in " cite$ * warning$
	  ""
	}
	{ key sortify }
      if$
    }
    { editor sort.format.names }
  if$
}

%			apalike uses two sorting passes; the first one sets the
%			labels so that the `a's, `b's, etc. can be computed;
%			the second pass puts the references in "correct" order.
%			The presort function is for the first pass. It computes
%			label, sort.label, and title, and then concatenates.
FUNCTION {presort}
{ calc.label
  label sortify
  "    "
  *
  type$ "book" =
  type$ "inbook" =
  or
    'author.editor.sort
    { type$ "proceedings" =
	'editor.sort
	'author.sort
      if$
    }
  if$
  #1 entry.max$ substring$	% for
  'sort.label :=		% apalike
  sort.label			% style
  *
  "    "
  *
  title field.or.null
  sort.format.title
  *
  #1 entry.max$ substring$
  'sort.key$ :=
}

ITERATE {presort}

SORT		% by label, sort.label, title---for final label calculation

STRINGS { last.label next.extra }	% apalike labels are only for the text;

INTEGERS { last.extra.num }		% there are none in the bibliography

FUNCTION {initialize.extra.label.stuff}	% and hence there is no `longest.label'
{ #0 int.to.chr$ 'last.label :=
  "" 'next.extra :=
  #0 'last.extra.num :=
}

FUNCTION {forward.pass}
{ last.label label =
    { last.extra.num #1 + 'last.extra.num :=
      last.extra.num int.to.chr$ 'extra.label :=
    }
    { "a" chr.to.int$ 'last.extra.num :=
      "" 'extra.label :=
      label 'last.label :=
    }
  if$
}

FUNCTION {reverse.pass}
{ next.extra "b" =
    { "a" 'extra.label := }
    'skip$
  if$
  year "in press" = 
  year "in preparation" = or
  year "submitted" = or
  extra.label "" = not and
    { label "-" * 'label := }
    { }
  if$
  label extra.label * 'label :=
  extra.label 'next.extra :=
}

EXECUTE {initialize.extra.label.stuff}

ITERATE {forward.pass}

REVERSE {reverse.pass}

%				Now that the label is right we sort for real,
%				on sort.label then year then title.  This is
%				for the second sorting pass.
FUNCTION {bib.sort.order}
{ sort.label
  "    "
  *
  year field.or.null sortify
  *
  "    "
  *
  title field.or.null
  sort.format.title
  *
  #1 entry.max$ substring$
  'sort.key$ :=
}

ITERATE {bib.sort.order}

SORT		% by sort.label, year, title---giving final bibliography order

FUNCTION {begin.bib}
{ preamble$ empty$				% no \etalchar in apalike
    'skip$
    { preamble$ write$ newline$ }
  if$
  "\begin{thebibliography}{}" write$ newline$		% no labels in apalike
}

EXECUTE {begin.bib}

EXECUTE {init.state.consts}

ITERATE {call.type$}

FUNCTION {end.bib}
{ newline$
  "\end{thebibliography}" write$ newline$
}

EXECUTE {end.bib}