1. Bloom, B.S. (Ed.). (1956). Taxonomy of educational objectives: Handbook 1. Cognitive domain. New York: David McKay.
2. Carpenter, T.P. (in press). Teaching as problem solving. In R.I. Charles & E.A. Silver, The teaching and assessing of mathematical problem solving. Reston, VA: National Council of Teachers of Mathematics and Hillsdale, NJ: Lawrence Erlbaum Associates.
3. National Longitudinal Study of Mathematical Abilities;FJ Crosswhite,1972
4. Dornbusch, S.M. (1974). To try or not to try. The Stanford Magazine, 2, 50–54.
5. Dowling, D.M. (1978). The development of a mathematics confidence scale and its application in the study of confidence in women college students. Unpublished doctoral dissertation, Columbus: Ohio State University.