Responsibility in mass communication / William L. Rivers and Wilbur Schramm. Rivers, William L. Schramm, Wilbur, 1907-1987, joint author. Mass media Social aspects. HM258 .S287 1969 301.243 RIR Includes bibliographical references and index New York : Harper & Row, 1969 1969 1969 Text vi, 314 p. ; eng