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Robert A. Hall Jr.: Italian phonemes and orthography. Italica, 1944, 21. vsk, nro 2, s. 72–82. American Association of Teachers of Italian. doi:10.2307/475860JSTOR:475860
Pier Marco Bertinetto, Michele Loporcaro: The sound pattern of Standard Italian, as compared with the varieties spoken in Florence, Milan and Rome. Journal of the International Phonetic Association, 2005, 35. vsk, nro 2, s. 131–151. doi:10.1017/S0025100305002148Artikkelin verkkoversio. Viitattu 17. joulukuuta 2021. (Arkistoitu – Internet Archive)
Pier Marco Bertinetto, Michele Loporcaro: The sound pattern of Standard Italian, as compared with the varieties spoken in Florence, Milan and Rome. Journal of the International Phonetic Association, 2005, 35. vsk, nro 2, s. 131–151. doi:10.1017/S0025100305002148Artikkelin verkkoversio. Viitattu 17. joulukuuta 2021. (Arkistoitu – Internet Archive)