1. Brunner, Edmund de S., et al. An Overview of Adult Education Research ( Chicago: Adult Education Association of the U. S. A. , 1959), pp. 48-49, 90.
2. Who Seeks Adult Education and Why
3. Johnstone, John W. C., and Rivera, Ramon J. Volunteers for Learning. ( Chicago: Aldine Publishing Company, 1965), p. 7.
4. Krathwohl, David R., Bloom, Benjamin S., and Masia, Bertram B. Taxonomy of Educational Objectives, Handbook II: Affective Domain. (New York: David McKay Company, Inc., 1964), p. 120.
5. Litchfield, Ann, "The Nature and Pattern of Participation in Adult Education Activities ," (Unpublished Ph. D. dissertation, Department of Education, University of Chicago, 1965), pp. 221, 226.