Issues in vowel harmony: proceedings of the CUNY Linguistics Conference on Vowel Harmony, 14th May 1977 / edited by Robert M. Vago
edited by Robert M. Vago
John Benjamins B.V., 1980
 Buku Teks SO
Issues in vowel harmony: proceedings of the CUNY Linguistics Conference on Vowel Harmony, 14th May 1977 / edited by Robert M. Vago
edited by Robert M. Vago
John Benjamins B.V., 1980
 Buku Teks SO
Mol, Hendrik, 1919-1981
Fundamentals of phonetics II : Acoustical models generating the formants of the vowel phonemes
Mouton, 1970
 Buku Teks
Lobel, Jason William
Vowel fronting, raising, and backing in Luzon and North-Central Sulawesi
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2021
 Artikel Jurnal
Goldwater, Rober
Artists on art : from the 14th to the 20th century /​ compiled and edited by Robert Goldwater and Marco Treves.
Murray, 1976.
 Buku Teks