1. Bourne, L.E.,Jr., Goldstein, S., & Link, W.E. Concept learning as a function of availability of previously presented information.Journal of Educational Psychology, 1964,67, 439–448.
2. Clark, C. D.. Teaching concepts in the classroom: A set of teaching prescriptions derived from educational psychology.Journal of Educational Psychology, June 1971,42, 253–276.
3. Cronbach, L.J. The logic of experiments on discovery. In L.S. Shulman & E.R. Keislar (Eds.),Learning by discovery: A critical appraisal. Chicago: Rand McNally, 1966.
4. Gagné, R.M. The learning of principles. In H.J. Klausmeier, & C.W. Harris (Eds.),Analyses of concept learning. New York: Academic Press, 1966.
5. Glaser, R. Variables in discovery learning. In L.S. Shulman & E.R. Keislar (Eds.),Learning by discovery: A critical appraisal. Chicago: Rand McNally, 1966.