1. Basic Motivations of Adults in Non-Credit Programs
2. Boyd, R. D. “The Study of Ego Identity,” unpublished manuscript, University of Wisconsin, Madison, 1965.
3. Analysis of the Ego-Stage Development of School-Age Children
4. Colley, L. “The Relation of Re-creation to a Theory of Ego Development,” unpublished doctoral dissertation, University of Wisconsin, Madison, 1966.