1. ?The Impact of Friendship Groups in a Multicultural University.? Unpublished doctoral dissertation, University of California, Los Angeles, 1998.
2. What Matters in College? Four Critical Years Revisited. San Francisco: Jossey-Bass, 1993.
3. Investment in Learning: The Individual and Social Value of American Higher Education. San Francisco: Jossey-Bass, 1977.
4. ?Racial Diversity in Higher Education: Does a Racially Mixed Student Population Affect Educational Outcomes?? Unpublished doctoral dissertation, University of California, Los Angeles, 1996.