APA (7e ed.) Bronvermelding

Não informado. (1941). Bell Telephone Magazine. American Telephone and Telegraph Company.

Chicago (17e ed.) Bronvermelding

Não informado. Bell Telephone Magazine. New York: American Telephone and Telegraph Company, 1941.

MLA (8e ed.) Bronvermelding

Não informado. Bell Telephone Magazine. American Telephone and Telegraph Company, 1941.

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