Cardiff: University of Wales Press, 1984, ISBN 0-7083-0861-9 Hayward, Katrina; Hayward, Richard J., Amharic, Handbook of the International Phonetic Association:
Haftendorn)(1990-1991) Maurice East(英语:Maurice East)(1991-1992) Hayward R. Alker, Jr.(英语:Hayward Alker)(1992-1993) Charles Kegley, Jr.(英语:Charles Kegley, Jr