1. Advantages of review exams in Keller Plan courses;Barnhill;American Journal of Physics,1974
2. Student-teacher contracts;Battino;Journal ofChemical Education,1973
3. No easy way. Experience with a modified Keller Plan physical chemistry course;Bent;Journal of Chemical Education,1974
4. Born, D. G. , Davis, M. , Whelan, P. & Jackson, D. (1972) Unpublished paper quoted by Kulik et al. (1974).
5. Teach yourself Paradigm: The Keller Plan;Elton;Chemistry in Britain,1973