Beck, Robert C. 1931- Motivation : theories and principles / Robert C. Beck. - Third edition. - Englewood Cliffs, N. J. : Prentice-Hall, 1990. - xii, 414 pages : illustrations ; 24 cm. Includes bibliographical references (p. 362-398) and index. ISBN: 0136030777 Subjects--Topical Terms: Motivation (Psychology)