Hybels, S. (1974). Speech communication. D. Van Nostrand.
Lua i Stíl Chicago (17ú heag.)Hybels, Saundra. Speech Communication. New York: D. Van Nostrand, 1974.
Lua MLA (9ú heag.)Hybels, Saundra. Speech Communication. D. Van Nostrand, 1974.
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