Verderber, Rudolph F. The challenge of effective speaking / Rudolph F. Verderber, Deanna D. Sellnow, Kathleen S. Verderber - 15th ed. - Australia : Wadsworth, 2012 - xx, 380 p. : ill. (some col.) ; 28 cm. E-B7/06471 (original, 2.929.500đ) ISBN: 1111346887 9781111346881 Subjects--Topical Terms: Public speaking Subjects--Index Terms: Diễn thuyết Thuyết trình Dewey Class. No.: 808.51