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Martínez-Celdrán, Eugenio; Fernández-Planas, Ana Ma.; Carrera-Sabaté, Josefina, Castilian Spanish, Journal of the International Phonetic Association, 2003, 33 (2): 255–259, ISSN 0025-1003, doi:10.1017/S0025100303001373
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Roach, Peter, British English: Received Pronunciation, Journal of the International Phonetic Association, 2004, 34 (2): 239–245, ISSN 0025-1003, doi:10.1017/S0025100304001768
Verhoeven, Jo, Belgian Standard Dutch, Journal of the International Phonetic Association, 2005, 35 (2): 243–247, doi:10.1017/S0025100305002173
Zimmer, Karl; Orgun, Orhan, Turkish(PDF), Handbook of the International Phonetic Association: A guide to the use of the International Phonetic Alphabet, Cambridge: Cambridge University Press: 154–158, 1999 [2015-11-20], ISBN 978-0-521-65236-0, (原始內容(PDF)存檔於2018-07-25)