半閉前圓唇元音
註釋

↑  国际语音学协会描写元音高度推荐用"开"和"闭"，不过许多语言学家也会用"高"和"低"。
↑  García, Fernando Álvarez-Balbuena. . Revista de Filoloxía Asturiana. 2015-09-01, 14 (14)  [2021-01-10]. ISSN 2341-1147. （原始内容存档于2020-09-06）.
1 2  Traunmüller (1982) harv error: no target: CITEREFTraunmüller1982 (help), cited in Ladefoged & Maddieson (1996:290頁) harv error: no target: CITEREFLadefogedMaddieson1996 (help)
1 2  Rowley (1990)，第422頁. sfnp error: no target: CITEREFRowley1990 (help)
↑  Ternes (1992)，第431, 433頁. sfnp error: no target: CITEREFTernes1992 (help)
↑  Basbøll (2005)，第46頁. sfnp error: no target: CITEREFBasbøll2005 (help)
↑  Basbøll & Wagner (1985:40頁) harv error: no target: CITEREFBasbøllWagner1985 (help), cited in Basbøll (2005:48頁) harv error: no target: CITEREFBasbøll2005 (help)。
↑  Gussenhoven (1999)，第74頁. sfnp error: no target: CITEREFGussenhoven1999 (help)
1 2 3  Collins & Mees (2003)，第133–134頁. sfnp error: no target: CITEREFCollinsMees2003 (help)
↑  Verhoeven (2005)，第245頁. sfnp error: no target: CITEREFVerhoeven2005 (help)
↑  Gussenhoven (1999)，第76頁. sfnp error: no target: CITEREFGussenhoven1999 (help)
↑  Collins & Mees (2003)，第133–135頁. sfnp error: no target: CITEREFCollinsMees2003 (help)
1 2  Wells (1982)，第607頁.
↑  Bauer & Warren (2004)，第582, 591頁.
↑  Bauer & Warren (2004)，第591頁.
↑  Collins & Mees (1990)，第95頁. sfnp error: no target: CITEREFCollinsMees1990 (help)
↑  Wells (1982)，第380–381頁.
↑  Tench (1990)，第136頁. sfnp error: no target: CITEREFTench1990 (help)
↑  Penhallurick (2004)，第104頁. sfnp error: no target: CITEREFPenhallurick2004 (help)
↑  Connolly (1990)，第125頁. sfnp error: no target: CITEREFConnolly1990 (help)
1 2  Wells (1982)，第375頁.
↑  Watt & Allen (2003)，第268–269頁. sfnp error: no target: CITEREFWattAllen2003 (help)
1 2  Lass (2002)，第116頁. sfnp error: no target: CITEREFLass2002 (help)
↑  Asu & Teras (2009)，第368頁.
1 2  Þráinsson (2004)，第350頁. sfnp error: no target: CITEREFÞráinsson2004 (help)
↑  Peterson (2000) harv error: no target: CITEREFPeterson2000 (help), cited in Árnason (2011:76頁) harv error: no target: CITEREFÁrnason2011 (help)
↑  Fougeron & Smith (1993)，第73頁. sfnp error: no target: CITEREFFougeronSmith1993 (help)
↑  Collins & Mees (2013)，第225頁. sfnp error: no target: CITEREFCollinsMees2013 (help)
↑  Kohler (1999)，第87頁. sfnp error: no target: CITEREFKohler1999 (help)
↑  Hall (2003)，第95, 107頁. sfnp error: no target: CITEREFHall2003 (help)
1 2  Dudenredaktion, Kleiner & Knöbl (2015)，第64頁. sfnp error: no target: CITEREFDudenredaktionKleinerKnöbl2015 (help)
↑  Szende (1994)，第92頁. sfnp error: no target: CITEREFSzende1994 (help)
↑  Maddieson & Anderson (1994)，第164頁. sfnp error: no target: CITEREFMaddiesonAnderson1994 (help)
↑  Khan & Lescot (1970)，第8-16頁. sfnp error: no target: CITEREFKhanLescot1970 (help)
↑  François (2013), p. 207.
↑  Peters (2006)，第119頁. sfnp error: no target: CITEREFPeters2006 (help)
↑  Verhoeven (2007)，第221頁. sfnp error: no target: CITEREFVerhoeven2007 (help)
↑  Gussenhoven & Aarts (1999)，第159頁. sfnp error: no target: CITEREFGussenhovenAarts1999 (help)
↑  Loporcaro, Michele. . Oxford University Press. 2015: 93–96  [2021-01-10]. ISBN 978-0-19-965655-4. （原始内容存档于2022-03-18）.
1 2  Prehn (2012)，第157頁. sfnp error: no target: CITEREFPrehn2012 (help)
↑  François (2013), p. 226.
1 2  Gilles & Trouvain (2013)，第72頁. sfnp error: no target: CITEREFGillesTrouvain2013 (help)
↑  Variação Linguística no Português Europeu: O Caso do Português dos Açores （页面存档备份，存于） （葡萄牙語）
↑  Lista das marcas dialetais e outros fenómenos de variação (fonética e fonológica) identificados nas amostras do Arquivo Dialetal do CLUP （页面存档备份，存于） （葡萄牙語）
↑  Stichting Kirchröadsjer Dieksiejoneer (1997)，第16頁. sfnp error: no target: CITEREFStichting_Kirchröadsjer_Dieksiejoneer1997 (help)
↑  Neuer kölnischer Sprachschatz (1956)，第627頁. sfnp error: no target: CITEREFNeuer_kölnischer_Sprachschatz1956 (help)
1 2  Peters (2017)，第?頁. sfnp error: no target: CITEREFPeters2017 (help)
1 2  van der Veen (2001)，第102頁. sfnp error: no target: CITEREFvan_der_Veen2001 (help)