APA (7e ed.) Bronvermelding

Não informado. (2004). International telephone review. International Telephone and Telegraph Corporation.

Chicago (17e ed.) Bronvermelding

Não informado. International Telephone Review. New York: International Telephone and Telegraph Corporation, 2004.

MLA (8e ed.) Bronvermelding

Não informado. International Telephone Review. International Telephone and Telegraph Corporation, 2004.

Let op: Deze citaties zijn niet altijd 100% accuraat.