Biagi, Shirley. Media/impact : an introduction to mass media / - 8th ed., 2009 update. - Boston : Wadsworth Cengage Learning, c2009. - xxxii, 400 pages : Illustrations ; - Wadsworth series in mass communication and journalism, . Includes index. ISBN: 9780495565963 (pbk.) 0495565962 (pbk.) Subjects--Topical Terms: Mass media. LC Class. No.: P 90 / BIA