Hellyer, H. W. (1971). Questions and answers on radio and television (3rd ed.). London: Newnes-Butterworths.
Παραπομπή Chicago StyleHellyer, H. W. Questions and Answers On Radio and Television. 3rd ed. London: Newnes-Butterworths, 1971.
Παραπομπή MLAHellyer, H. W. Questions and Answers On Radio and Television. 3rd ed. London: Newnes-Butterworths, 1971.
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