Orr, W. I. (1978). Radio handbook: Twenty-first edition. ndianapolis: Editors and Engineers.
Trích dẫn kiểu ChicagoOrr, William I. Radio Handbook: Twenty-first Edition. ndianapolis: Editors and Engineers, 1978.
Deismireacht MLAOrr, William I. Radio Handbook: Twenty-first Edition. ndianapolis: Editors and Engineers, 1978.
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