Não informado. (1941). Bell Telephone Magazine. American Telephone and Telegraph Company.
Style de citation Chicago (17e éd.)Não informado. Bell Telephone Magazine. New York: American Telephone and Telegraph Company, 1941.
Style de citation MLA (8e éd.)Não informado. Bell Telephone Magazine. American Telephone and Telegraph Company, 1941.
Attention : ces citations peuvent ne pas être correctes à 100%.