Horn, L. (1996). Nontraditional Undergraduates: Trends in Enrollment From 1986 to 1992 and Persistence and Attainment Among 1989-90 Beginning Postsecondary Students (NCES 97-578). U.S. Department of Education. Washington, DC: National Center for Education Statistics.

Horn, L., and Premo, M.D. (1995). Profile of Undergraduates in U.S. Postsecondary Education Institutions: 1992-93, With an Essay on Undergraduates at Risk (NCES 96-237). U.S. Department of Education. Washington, DC: National Center for Education Statistics.