Wells, John C. Phonetic symbols in word processing and on the web(PDF). Solé, Maria-Josep; Recasens, Daniel; Romero, Joaquín (编). Proceedings of the 15th International Congress of Phonetic Sciences. Barcelona. 2003 [2019-06-05]. (原始内容存档(PDF)于2018-09-02).
Wells, John C. Phonetic symbols in word processing and on the web(PDF). Solé, Maria-Josep; Recasens, Daniel; Romero, Joaquín (编). Proceedings of the 15th International Congress of Phonetic Sciences. Barcelona. 2003 [2019-06-05]. (原始内容存档(PDF)于2018-09-02).