Verderber, Rudolph F, The Challenge of effective speaking in a digital age / Rudolph F. Verderber, Deanna D. Sellnow ; [edited by] Kassi Radomski, Cara Douglass-Graff. - Sixteenth edition. - xx, 368 pages : illustrations ; 27 cm. ISBN: 9781285094847 (hard copy : alk. paper) RM865.28 Subjects--Topical Terms: Public speaking.