Head, S. W. (1985). World broadcasting systems: A comparative analysis. Wadsworth Pub. Co..
Lua i Stíl Chicago (17ú heag.)Head, Sydney W. World Broadcasting Systems: A Comparative Analysis. Belmont, Calif.: Wadsworth Pub. Co., 1985.
Lua MLA (9ú heag.)Head, Sydney W. World Broadcasting Systems: A Comparative Analysis. Wadsworth Pub. Co., 1985.
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