Cox, F.M. (2006), „The acoustic characteristics of /hVd/ vowels in the speech of some Australian teenagers”, Australian Journal of Linguistics, 26 (2): 147—179, S2CID62226994, doi:10.1080/07268600600885494
Durie, M.; Hajek, J. (1994), „A revised standard phonemic orthography for Australian English vowels”, Australian Journal of Linguistics, 14 (1): 93—107, doi:10.1080/07268609408599503
Iivonen & Harnud 2005, стр. 62, 66-67 Iivonen, Antti; Harnud, Huhe (2005), „Acoustical comparison of the monophthong systems in Finnish, Mongolian and Udmurt”, Journal of the International Phonetic Association, 35 (1): 59—71, S2CID145733117, doi:10.1017/S002510030500191X
Cox, F.M. (2006), „The acoustic characteristics of /hVd/ vowels in the speech of some Australian teenagers”, Australian Journal of Linguistics, 26 (2): 147—179, S2CID62226994, doi:10.1080/07268600600885494
Iivonen & Harnud 2005, стр. 62, 66-67 Iivonen, Antti; Harnud, Huhe (2005), „Acoustical comparison of the monophthong systems in Finnish, Mongolian and Udmurt”, Journal of the International Phonetic Association, 35 (1): 59—71, S2CID145733117, doi:10.1017/S002510030500191X