Biagi, Shirley. Media/impact : an introduction to mass media : instructor's edition / Shirley Biagi. - 4th ed. - Belmont, CA : Wadsworth Pub. Co., c1999. - xxvii, 428 p. : ill. (some col.) ; 26 cm. Includes bibliographical references (p. 405-412) and index. ISBN: 0534548113 (pbk.) Subjects--Topical Terms: Mass media.Mass media. Dewey Class. No.: 302.23