Bergevin, P. and J. McKinley (1965) Participation Training for Adult Education. St. Louis: Bethany.
2.
Flynn, E.W. and J. F. La Faso (1972) Group Discussion as Learning Process: A Sourcebook. New York: Paulist.
3.
Hill, W.F. (1969) Learning Through Discussion. Beverly Hills, CA: Sage.
4.
McKENZIE, L. R. [ed.] (1975) "Participation training: a system for adult education Viewpoints (Bulletin of the School of Education , Indiana University, Bloomington, Indiana) 51 (July).