APA (7th ed.) Zitazioa
Valenti, J. (1982). Speak up with confidence: How to prepare, learn, and deliver effective speeches. Morrow.
Chicago Style (17th ed.) Zitazioa
Valenti, Jack. Speak Up with Confidence: How to Prepare, Learn, and Deliver Effective Speeches. New York: Morrow, 1982.
MLA (9th ed.) Zitazioa
Valenti, Jack. Speak Up with Confidence: How to Prepare, Learn, and Deliver Effective Speeches. Morrow, 1982.
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