Não informado. (1953). Communication engineering. [s.n.].
Chicago (17e ed.) BronvermeldingNão informado. Communication Engineering. Great Barrington, Mass: [s.n.], 1953.
MLA (8e ed.) BronvermeldingNão informado. Communication Engineering. [s.n.], 1953.
Let op: Deze citaties zijn niet altijd 100% accuraat.