Martínez-Celdrán, Eugenio; Fernández-Planas, Ana Ma.; Carrera-Sabaté, Josefina (2003), „Castilian Spanish”, Journal of the International Phonetic Association, 33 (2): 255, doi:10.1017/S0025100303001373
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Martínez-Celdrán, Eugenio; Fernández-Planas, Ana Ma.; Carrera-Sabaté, Josefina (2003), „Castilian Spanish”, Journal of the International Phonetic Association, 33 (2): 255, doi:10.1017/S0025100303001373