Verderber, Rudolph F. The challenge of effective speaking / Rudolph F. Verderber. - 6th ed. - Belmont, Calif. : Wadsworth Pub. Co., [1984], c1985. - xiii, 400 p. : ill. ; 22 cm. Includes index. ISBN: 0534038859 (pbk.) LCCN: 84011959 Subjects--Topical Terms: Public speaking. LC Class. No.: PN4121 / .V4 1985 Dewey Class. No.: 808.5/1