Não informado. (2001). Volta voices. Alexander Graham Bell Association for the Deaf and Hard of Hearing.
Chicago-referens (17:e uppl.)Não informado. Volta Voices. Washington: Alexander Graham Bell Association for the Deaf and Hard of Hearing, 2001.
MLA-referens (8:e uppl.)Não informado. Volta Voices. Alexander Graham Bell Association for the Deaf and Hard of Hearing, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.