Lugo, James O. Human development : a psychological, biological, and sociological approach to the life span / James O. Lugo, Gerald L. Hershey. - 2d ed. / prepared by James O. Lugo. - New York : Macmillan, c1979. - 770 p. : ill. ; 25 cm. Includes bibliographies and index. ISBN: 0023723203 LCCN: 78001702 Subjects--Topical Terms: Developmental psychology. LC Class. No.: BF 713 / .L83 1979