半閉後不圓唇元音（英語：close-mid back unrounded vowel、high-mid back unrounded vowel[1]）是相應的半閉後圓唇元音/o/的扁唇音。發音同/o/但是口型不圓。
- 其元音舌位是後，表示舌頭的位置會盡可能地朝向口腔後部，但不至於阻礙氣流而被歸類為子音。
- 其圓唇度為不圓唇元音，嘴唇自然放鬆，不特別向前突起。
- Asu, Eva Liina; Teras, Pire, Estonian, Journal of the International Phonetic Association, 2009, 39 (3): 367–372, doi:10.1017/s002510030999017x
- Bauer, Laurie; Warren, Paul, New Zealand English: phonology, Schneider, Edgar W.; Burridge, Kate; Kortmann, Bernd; Mesthrie, Rajend; Upton, Clive (編), A handbook of varieties of English, 1: Phonology, Mouton de Gruyter: 580–602, 2004, ISBN 3-11-017532-0
- Booij, Geert, The phonology of Dutch, Oxford University Press, 1999, ISBN 0-19-823869-X
- Bowerman, Sean, White South African English: phonology, Schneider, Edgar W.; Burridge, Kate; Kortmann, Bernd; Mesthrie, Rajend; Upton, Clive (編), A handbook of varieties of English, 1: Phonology, Mouton de Gruyter: 931–942, 2004, ISBN 3-11-017532-0
- Chirkova, Katia; Chen, Yiya; Kocjančič Antolík, Tanja, Xumi, Part 2: Upper Xumi, the Variety of the Upper Reaches of the Shuiluo River (PDF), Journal of the International Phonetic Association, 2013, 43 (3): 381–396, doi:10.1017/S0025100313000169 [永久失效連結]
- Eades, Domenyk; Hajek, John, Gayo, Journal of the International Phonetic Association, 2006, 36 (1): 107–115, doi:10.1017/S0025100306002416
- Finn, Peter, Cape Flats English: phonology, Schneider, Edgar W.; Burridge, Kate; Kortmann, Bernd; Mesthrie, Rajend; Upton, Clive (編), A handbook of varieties of English, 1: Phonology, Mouton de Gruyter: 934–984, 2004, ISBN 3-11-017532-0
- Gimson, Alfred Charles, Cruttenden, Alan , 編, Gimson's Pronunciation of English 8th, Routledge, 2014 [2018-02-15], ISBN 9781444183092, （原始內容存檔於2019-06-02）
- Jolkesky, Marcelo Pinho de Valhery, Fonologia e prosódia do Kaingáng falado em Cacique Doble, Anais do SETA (Campinas: Editora do IEL-UNICAMP), 2009, 3: 675–685 [2018-02-15], （原始內容存檔於2012-03-04）
- Kruspe, Nicole; Hajek, John, Mah Meri, Journal of the International Phonetic Association, 2009, 39 (2): 241–248, doi:10.1017/S0025100309003946
- Mesthrie, Rajend, Indian South African English: phonology, Schneider, Edgar W.; Burridge, Kate; Kortmann, Bernd; Mesthrie, Rajend; Upton, Clive (編), A handbook of varieties of English, 1: Phonology, Mouton de Gruyter: 953–963, 2004, ISBN 3-11-017532-0
- Ní Chasaide, Ailbhe, Irish, Handbook of the International Phonetic Association, Cambridge University Press: 111–16, 1999, ISBN 0-521-63751-1
- Nowikow, Wieczysław, Fonetyka hiszpańska 3rd, Warsaw: Wydawnictwo Naukowe PWN, 2012 [First published 1992], ISBN 978-83-01-16856-8
- Tingsabadh, M. R. Kalaya; Abramson, Arthur S., Thai, Journal of the International Phonetic Association, 1993, 23 (1): 24–28, doi:10.1017/S0025100300004746
- Wells, John C., Accents of English 3: Beyond The British Isles, Cambridge: Cambridge University Press, 1982, ISBN 0-521-28541-0
.svg)
