1. (1994). Exploring the autotelic personality. Unpublished doctoral dissertation, University of Chicago: Chicago, IL.
2. & (1991). Multiple regression: Testing and interpreting interactions. Newbury Park, CA: Sage.
3. An empirical test of a new theory of human needs
4. (1964). Introduction to motivation. New York: Van Nostrand.
5. (1974). The mainsprings of achievement oriented activity. In & (Eds.), Motivation and achievement (pp. 11-39). Washington, DC: Winston.