@article{Chao:ToneLetters,
  author = "Chao, Yuen-Ren",
  title = "A system of tone letters",
  journal = "Le Ma\^itre Phon\'etique",
  number = "30",
  pages = "24--27",
  year = 1933 }

@booklet{Principles,
  author = "IPA",
  title = "{\em The Principles of the International Phonetic Association}",
  year = 1949 }

@book{PSG,
  author = "Pullum, Geoffrey K. and Ladusaw, William A.",
  title = "Phonetic Symbol Guide",
  publisher = "The University of Chicago Press",
  year = 1986 }

@article{IPA:KielConvention,
  author = "IPA",
  title = "{Report on the 1989 Kiel Convention}",
  journal = "Journal of the International Phonetic Association",
  volume = "19",
  number = "2",
  pages = "67--80",
  year = 1989 }

@article{Esling:IPAcoding,
  author = "Esling, John",
  title = "Computer coding of the {IPA}: Supplementary Report",
  journal = "Journal of the International Phonetic Association",
  volume = "20",
  number = "1",
  pages = "22--26",
  year = 1990 }

@article{Pullum:Remarks,
  author = "Pullum, Geoffrey K.",
  title = "{Remarks on the 1989 revision of the International Phonetic
          Alphabet}",
  journal = "Journal of the International Phonetic Association",
  volume = "20",
  number = "1",
  pages = "33--40",
  year = 1990 }

@article{IPA:FurtherReport,
  author = "IPA",
  title = "{Further report on the 1989 Kiel Convention}",
  journal = "Journal of the International Phonetic Association",
  volume = "20",
  number = "2",
  pages = "22--24",
  year = 1990 }

@book{Jones:Outline,
  author = "Jones, Daniel",
  title = "An Outline of English Phonetics",
  publisher = "Cambridge: W.\ Heffer",
  year = "1918, (9th edition) 1960" }

@book{Ladefoged:Course,
  author = "Ladefoged, Peter",
  title = "A Course in Phonetics, Third Edition",
  publisher = "Harcourt Brace Jovanovich College Publishers",
  year = 1993 }

@article{IPA:CouncilActions,
  author = "IPA",
  title = "{Council actions on revisions of the IPA}",
  journal = "Journal of the International Phonetic Association",
  volume = "23",
  number = "1",
  pages = "32--34",
  year = 1993 }

@article{Esling:ComputerCodes,
  author = "Esling, John H. and Gaylord, Harry",
  title = "Computer Codes for Phonetic Symbols",
  journal = "Journal of the International Phonetic Association",
  volume = "23",
  number = "2",
  pages = "83--97",
  year = 1993 }

@unpublished{SAMPA,
  author = "Wells, John C.",
  title = "Computer-coding the {IPA}: a proposed extension of {SAMPA}",
  note = "Revised draft 1995 04 28",
  year = 1995 }

@unpublished{extIPA,
  author = "ICPLA",
  title = "{extIPA Symbols for Disorderd Speech}",
  note = "1994",
  year = 1994 }

@unpublished{VoQS,
  author = "Ball, Martin J. and Esling, John and Dickson, Craig",
  title = "{VoQS: Voice Quality Symbols}",
  note = "1994",
  year = 1994 }