Berry, W.D., and Feldman, S. (1987). Multiple Regression in Practice, Vol. 50. Beverly Hills, CA: Sage Publications, Inc.

Choy, S.P. and Geis, S. (1997). Early Labor Force Experiences and Debt Burden (NCES 97–286). U.S. Department of Education, National Center for Education Statistics. Washington, DC: U.S. Government Printing Office.

Dunn, O. J., (1961). Multiple Comparisons Among Means. Journal of the American Statistical Association 56 : 52–64.

Green, P.J., Meyers, S.L., Giese, P., Law, J., Speizer, H.M., Tardino, V.S., and Knepper, P. (1996). Baccalaureate and Beyond Longitudinal Study: 1993/94 Methodology Report (NCES 96–149). U.S. Department of Education, National Center for Education Statistics. Washington, DC: U.S. Government Printing Office.

Green, P.J., Meyers, S.L., Veldman, C., Pedlow, S., and Knepper, P. (1999) Baccalaureate and Beyond Longitudinal Study: 1993/97 Methodology Report (NCES 1999–159). U.S. Department of Education, National Center for Education Statistics. Washington, DC: U.S. Government Printing Office.

Lewis-Beck, M.S. (1980). Applied Regression: An Introduction, Vol. 22 Beverly Hills, CA: Sage Publications, Inc.

Loft, J.D., Riccobono J.A., Whitmore, R.W., Fitzgerald, R.A., Berkner, L.B., and Malizio, A.G. (1995). Methodology Report for the National Postsecondary Student Aid Study, 1992–93 (NCES 95–211). U.S. Department of Education, National Center for Education Statistics. Washington, DC: U.S. Government Printing Office.

Skinner, C.J., Holt, D., and Smith, T.M.F. (Eds.).(1989) Analysis of Complex Surveys. New York: John Wiley & Sons.