Sydney W. Head, C. H. S. Broadcasting in America a survey of electronic media. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Sydney W. Head, Christopher H. Sterling. Broadcasting in America a Survey of Electronic Media. Houghton Mifflin.
Lua MLA (8ú heag.)Sydney W. Head, Christopher H. Sterling. Broadcasting in America a Survey of Electronic Media. Houghton Mifflin.
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