Phonetic Association: A guide to the use of the International Phonetic Alphabet, Cambridge: Cambridge University Press: 45–50, 1999, ISBN 0-521-65236-7
Phonetic Association: A Guide to the usage of the International Phonetic Alphabet., Cambridge: Cambridge University Press: 140–142, 1999, ISBN 0-521-63751-1
Phonetic Association: A guide to the use of the International Phonetic Alphabet, Cambridge: Cambridge University Press: 66–69, 1999, ISBN 0-521-65236-7
Phonetic Association: A guide to the use of the International Phonetic Alphabet, Cambridge: Cambridge University Press: 135–139, 1999, ISBN 0-521-65236-7