Não informado. (1953). Communication engineering. [s.n.].
Chicagoスタイル(17版)引用形式Não informado. Communication Engineering. Great Barrington, Mass: [s.n.], 1953.
MLA(8版)引用形式Não informado. Communication Engineering. [s.n.], 1953.
警告: この引用は必ずしも正確ではありません.