Não informado. (2004). International telephone review. International Telephone and Telegraph Corporation.
Chicago-referens (17:e uppl.)Não informado. International Telephone Review. New York: International Telephone and Telegraph Corporation, 2004.
MLA-referens (8:e uppl.)Não informado. International Telephone Review. International Telephone and Telegraph Corporation, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.