Brunner, Edmund de S.et. al.
(1959). An overview of adult education research.Chicago: Adult Education Association of the U.S.A.
2.
Jensen, Gale E.
, Liveright, A. A., and Hallenbeck W. (Eds.). (1964). Adult education: Outlines of an emerging field of university study.Chicago: Adult Education Association of the U.S.A.
3.
Kreitlow, Burton R.
(1981). Examining controversies of adult education.San Fransisco: Jossey-Bass.