Okada (1999), p. 117. Okada, Hideo (1999), "Japanese", in International Phonetic Association (ed.), Handbook of the International Phonetic Association: A Guide to the Use of the International Phonetic Alphabet, Cambridge University Press, pp. 117–119, ISBN978-0-52163751-0
Adams (1975), p. 288. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), p. 283. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Merrill (2008), p. 108. Merrill, Elizabeth (2008), "Tilquiapan Zapotec", Journal of the International Phonetic Association, 38 (1): 107–114, doi:10.1017/S0025100308003344
Adams (1975), p. 286. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), pp. 285–286. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), p. 285. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), p. 289. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Watson (2007), pp. 352–353. Watson, Kevin (2007), "Liverpool English", Journal of the International Phonetic Association, 37 (3): 351–360, doi:10.1017/s0025100307003180
Adams (1975), p. 288. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), p. 283. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Zvelebil, Kamil (1965). Some features of Ceylon Tamil. Indo-Iranian Journal. Vol. 9. JSTOR. pp. 113–138. JSTOR24650188.
Adams (1975), p. 286. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), pp. 285–286. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), p. 285. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Adams (1975), p. 289. Adams, Douglas Q. (1975), "The Distribution of Retracted Sibilants in Medieval Europe", Language, 51 (2): 282–292, doi:10.2307/412855, JSTOR412855
Zimmer & Orgun (1999), p. 154. Zimmer, Karl; Orgun, Orhan (1999), "Turkish"(PDF), Handbook of the International Phonetic Association: A guide to the use of the International Phonetic Alphabet, Cambridge: Cambridge University Press, pp. 154–158, ISBN978-0-521-65236-0, archived from the original(PDF) on 2018-07-25, retrieved 2015-04-12
Zimmer & Orgun (1999), p. 154. Zimmer, Karl; Orgun, Orhan (1999), "Turkish"(PDF), Handbook of the International Phonetic Association: A guide to the use of the International Phonetic Alphabet, Cambridge: Cambridge University Press, pp. 154–158, ISBN978-0-521-65236-0, archived from the original(PDF) on 2018-07-25, retrieved 2015-04-12