1. Bean , J. P. 1981 Student attrition, intentions, and confidence: Interaction effects in a path model. Part I, the 23 variable model
2. Chiang , S. Hawley , J. 2013 Applying event history analysis to investigate the impacts of developmental education on emerging adults' degree completion
3. Christie , N. G. Dinham , S. M. 1990 Elaboration of Tinto's model of college student departure: A qualitative study of freshman experiences
4. Garson , G. D. 2010 Cox regression http://chass.ncsu.edu/garson/PA765/statnote.htm