KellerG. (1985). Trees without fruit: The problem with research about higher education. Change, 17(1), 7–10.
2.
PullenR.OrtloffV.CaseyS., & PayneJ. B. (2000). Analysis of academic misconduct using unobtrusive research: A study of discarded cheat sheets. College Student Journal, 34(4), 616.
3.
TintoV. (1993). Leaving college: Rethinking the causes and cures of student attrition (2nd ed.). Chicago: University of Chicago.