Não informado. (1941). Bell Telephone Magazine. American Telephone and Telegraph Company.
Chicagoスタイル(17版)引用形式Não informado. Bell Telephone Magazine. New York: American Telephone and Telegraph Company, 1941.
MLA(8版)引用形式Não informado. Bell Telephone Magazine. American Telephone and Telegraph Company, 1941.
警告: この引用は必ずしも正確ではありません.