Jacobson,Steven(1995),A Practical Grammar of the Central Alaskan Yup'ik Eskimo Language,Fairbanks:Alaska Native Language Center,ISBN978-1-55500-050-9
Jones,Glyn E.(1984),“The distinctive vowels and consonants of Welsh”,inMartin J. Ball and Glyn E. Jones,Welsh Phonology: Selected Readings,Cardiff:University of Wales Press,pp.40–64,ISBN0-7083-0861-9