Bettinghaus, E. P. (1994). Persuasive communication Campaigns. Harcourt Brace College.
Lua i Stíl Chicago (17ú heag.)Bettinghaus, Erwin P. Persuasive Communication Campaigns. Harcourt Brace College, 1994.
Lua MLA (8ú heag.)Bettinghaus, Erwin P. Persuasive Communication Campaigns. Harcourt Brace College, 1994.
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