Duckworth, Martin; Allen, George; Hardcastle, William; Ball, Martin (1990). "Extensions to the International Phonetic Alphabet for the transcription of atypical speech". Clinical Linguistics & Phonetics. 4 (4): 278. doi:10.3109/02699209008985489. ISSN0269-9206.
Tench, Paul (11 August 2011). Transcribing the Sound of English: A Phonetics Workbook for Words and Discourse. Cambridge University Press. p. 61. doi:10.1017/cbo9780511698361. ISBN978-1-107-00019-3.
Martin J. Ball; Joan Rahilly (August 2011). "The symbolization of central approximants in the IPA". Journal of the International Phonetic Association. 41 (2). Cambridge Journals Online: 231–237. doi:10.1017/s0025100311000107. S2CID144408497.
Olson, Kenneth S.; Hajek, John (1999). "The phonetic status of the labial flap". Journal of the International Phonetic Association. 29 (2): 101–114. doi:10.1017/s0025100300006484. S2CID14438770.
Wells, John (9 September 2009). "click symbols". John Wells's phonetic blog. Archived from the original on 30 November 2018. Retrieved 18 October 2010.
Martin J. Ball; Joan Rahilly (August 2011). "The symbolization of central approximants in the IPA". Journal of the International Phonetic Association. 41 (2). Cambridge Journals Online: 231–237. doi:10.1017/s0025100311000107. S2CID144408497.
Olson, Kenneth S.; Hajek, John (1999). "The phonetic status of the labial flap". Journal of the International Phonetic Association. 29 (2): 101–114. doi:10.1017/s0025100300006484. S2CID14438770.
sfu.ca
Alderete, John; Jebbour, Abdelkrim; Kachoub, Bouchra; Wilbee, Holly. "Tashlhiyt Berber grammar synopsis"(PDF). Simon Fraser University. Archived(PDF) from the original on 28 December 2021. Retrieved 20 November 2021.
sil.org
Cf. the /ʷ.../ and /ʲ.../ transcriptions in Ernst-Kurdi, Eszter (2017). "The Phonology of Mada". SIL Yaoundé.
Alderete, John; Jebbour, Abdelkrim; Kachoub, Bouchra; Wilbee, Holly. "Tashlhiyt Berber grammar synopsis"(PDF). Simon Fraser University. Archived(PDF) from the original on 28 December 2021. Retrieved 20 November 2021.
Wells, John (9 September 2009). "click symbols". John Wells's phonetic blog. Archived from the original on 30 November 2018. Retrieved 18 October 2010.
Duckworth, Martin; Allen, George; Hardcastle, William; Ball, Martin (1990). "Extensions to the International Phonetic Alphabet for the transcription of atypical speech". Clinical Linguistics & Phonetics. 4 (4): 278. doi:10.3109/02699209008985489. ISSN0269-9206.