Grosset, Jane M. (1991). Patterns of integration, commitment, and student characteristics and retention among younger and older students. Research in Higher Education, 32(2):159-178.
2.
Metzner, Barbara, & Bean, John. (1987). An estimation of a conceptual model of nontraditional undergraduate student attrition. Research in Higher Education, 27(1):15-36.
3.
Tinto, Vincent. (1987). Leaving college. Chicago: The University of Chicago Press.
