Mager, Robert F. Developing vocational instruction / Robert F. Mager and Kenneth M. Beach, Jr. - Belmont, CA : David S. Lake Publishers, ©1967. - x, 83 p. ; 22 cm. ISBN: 0822420600 9780822420606 Subjects--Topical Terms: Vocational education -- Study and teaching. Dewey Class. No.: 370.113 / MAG