半閉央圓唇元音
參考文獻

Árnason, Kristján, , Oxford University Press, 2011, ISBN 978-0-19-922931-4
Bauer, Laurie; Warren, Paul; Bardsley, Dianne; Kennedy, Marianna; Major, George, , Journal of the International Phonetic Association, 2007, 37 (1): 97–102  [2018-02-15], doi:10.1017/S0025100306002830, （原始内容存档于2017-05-23）
Chirkova, Katia; Chen, Yiya,  (PDF), Journal of the International Phonetic Association, 2013, 43 (3): 363–379, doi:10.1017/S0025100313000157 [永久]
Chirkova, Katia; Chen, Yiya; Kocjančič Antolík, Tanja,  (PDF), Journal of the International Phonetic Association, 2013, 43 (3): 381–396, doi:10.1017/S0025100313000169 [永久]
Collins, Beverley; Mees, Inger M., , Coupland, Nikolas; Thomas, Alan Richard  (编), , Multilingual Matters Ltd.: 87–103, 1990  [2018-02-15], ISBN 1-85359-032-0, （原始内容存档于2017-03-11）
Collins, Beverley; Mees, Inger M.,  (PDF) 5th, Leiden: Brill Publishers, 2003 [First published 1981]  [2018-02-15], ISBN 9004103406, （原始内容 (PDF)存档于2016-12-28）
Cox, F.M., , Australian Journal of Linguistics, 2006, 26: 147–179  [2018-02-15], doi:10.1080/07268600600885494, （原始内容存档于2008-09-24）
Crosswhite, Katherine Margaret,  (PDF), University of Rochester Working Papers in the Language Sciences, 2000, 1 (1): 107–172  [2018-02-15], （原始内容 (PDF)存档于2012-02-06）
Einarsson, Stefán, , Baltimore: The Johns Hopkins Press, 1945, ISBN 978-0801863578
Engstrand, Olle, , , Cambridge: Cambridge University Press, 1999, ISBN 0-521-63751-1
Fougeron, Cecile; Smith, Caroline L, , Journal of the International Phonetic Association, 1993, 23 (2): 73–76, doi:10.1017/S0025100300004874
François, Alexandre, , Mailhammer, Robert  (编), , Studies in Language Change 11, Berlin: DeGruyter Mouton: 185–244, 2013  [2018-02-15], （原始内容存档于2020-07-23）
Gussenhoven, Carlos, , Journal of the International Phonetic Association, 1992, 22 (2): 45–47, doi:10.1017/S002510030000459X
Gussenhoven, Carlos; Aarts, Flor,  (PDF), Journal of the International Phonetic Association (University of Nijmegen, Centre for Language Studies), 1999, 29: 155–166  [2018-02-15], doi:10.1017/S0025100300006526, （原始内容 (PDF)存档于2017-10-11）
Gussenhoven, Carlos,  (PDF), Nijmegen: Radboud University, 2007  [2018-02-15], （原始内容存档 (PDF)于2017-03-25） （荷兰语）
Gussmann, Edmund.  (PDF). Folia Scandinavica Posnaniensia. 2011, 12: 71–90  [2018-02-15]. ISBN 978-83-232-2296-5. （原始内容存档 (PDF)于2015-04-02）.
Hoekstra, Jarich, ,  (PDF) 18, Amsterdam: John Benjamins Publishing Company: 193–209, 2003  [2018-02-15], ISBN 978-90-272-1856-8, （原始内容存档 (PDF)于2016-03-04）
Hof, Jan Jelles,  (PDF), The Hague: Martinus Nijhoff, 1933  [2018-02-15], （原始内容 (PDF)存档于2016-10-07）
Ido, Shinji, , Journal of the International Phonetic Association, 2014, 44 (1): 87–102, doi:10.1017/S002510031300011X
Iivonen, Antti; Harnud, Huhe, , Journal of the International Phonetic Association, 2005, 35 (1): 59–71, doi:10.1017/S002510030500191X
Jones, Daniel; Ward, Dennis, , Cambridge University Press, 1969
Khan, Sameer ud Dowla; Weise, Constanze,  (PDF), Journal of the International Phonetic Association, 2013, 43 (2): 231–241  [2018-02-15], doi:10.1017/S0025100313000145, （原始内容存档 (PDF)于2015-01-28）
Kristoffersen, Gjert, , Oxford University Press, 2000, ISBN 978-0-19-823765-5
Lass, Roger, , Mesthrie, Rajend  (编), , Cambridge University Press, 2002, ISBN 9780521791052
Ó Sé, Diarmuid, , Dublin: Institiúid Teangeolaíochta Éireann, 2000, ISBN 0-946452-97-0 （爱尔兰语）
Popperwell, Ronald G., , Cambridge University Press, 2010 [First published 1963]  [2018-02-15], ISBN 978-0-521-15742-1, （原始内容存档于2019-06-08）
Strandskogen, Åse-Berit, , Oslo: Gyldendal, 1979, ISBN 82-05-10107-8
Tiersma, Peter Meijes,  2nd, Ljouwert: Fryske Akademy, 1999 [First published 1985 in Dordrecht by Foris Publications], ISBN 90-6171-886-4
van Heuven, Vincent J.; Genet, Roos. . Dag van de Fonetiek. Utrecht. 2002.
Vanvik, Arne, , Oslo: Universitetet i Oslo, 1979, ISBN 82-990584-0-6
Verhoeven, Jo, , Journal of the International Phonetic Association, 2005, 35 (2): 245, doi:10.1017/S0025100305002173
Verhoeven, Jo, , Journal of the International Phonetic Association, 2007, 37 (2): 219–225, doi:10.1017/S0025100307002940
Williams, Ann; Kerswill, Paul, , Foulkes, Paul; Docherty, Gerard  (编),  (PDF), London: Arnold: 141–162, 1999  [2018-02-15], （原始内容存档 (PDF)于2012-09-16）