Marx, Melvin Herman. Motivation : Psychological principles and educational implications / [By] Melvin H. Marx [and] Tom N. Tombaugh. - San Francisco : Chandler Publ. Co., [1967]. - xiii, 285 p. : ill. ; 21 cm. - Chandler publications in educational psychology . Bibliogr.: p. 253-276. Subjects--Topical Terms: Motivation (Psychology)Educational psychology Dewey Class. No.: 152.5