Não informado. (2001). Volta voices. Alexander Graham Bell Association for the Deaf and Hard of Hearing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Volta Voices. Washington: Alexander Graham Bell Association for the Deaf and Hard of Hearing, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Volta Voices. Alexander Graham Bell Association for the Deaf and Hard of Hearing, 2001.
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