1. Survival Analysis Using the SAS System: A Practical Guide;Allison,1995
2. Drug use prevention data, missed assessments and survival analysis;Bacik;Multivariate Behavioral Research,1998
3. Proportional hazards models of graduation;Chimka;Journal of College Student Retention: Research, Theory and Practice,2008
4. Regression models and life tables (with discussion);Cox;Journal of the Royal Statistical Society,1972
5. Analysis of Survival Data;Cox,1984