Child development : an introduction / Steven R. Yussen, John W. Santrock. Yussen, Steven R. Santrock, John W., joint author. Child psychology. Child development. BF721 .Y85 136.7 YUC Includes indexes. Bibliography: p. 600-627. Dubuque, Iowa : W. C. Brown Co., c1978. c1978. 1978 Text xxiii, 647 p. : eng