O'Hair, D., & Friedrich, G. W. (1997). Competent communication (2nd ed.). St. Martin's.
Lua i Stíl Chicago (17ú heag.)O'Hair, Dan, agus Gustav W. Friedrich. Competent Communication. 2nd ed. New York: St. Martin's, 1997.
Lua MLA (9ú heag.)O'Hair, Dan, agus Gustav W. Friedrich. Competent Communication. 2nd ed. St. Martin's, 1997.
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