APA (7e ed.) Bronvermelding

Não informado. (2003). Electrical Communication. International Telephone and Telegraph Corporation.

Chicago (17e ed.) Bronvermelding

Não informado. Electrical Communication. New York: International Telephone and Telegraph Corporation, 2003.

MLA (8e ed.) Bronvermelding

Não informado. Electrical Communication. International Telephone and Telegraph Corporation, 2003.

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