1. (Ed.), Taxonomy of Educational Objectives, Handbook I: Cognitive Domain. David McKay, New York, 1968.
2. Biological Science Curriculum Study, BSCS Newsletter, No. 19, 1963.
3. The Validation of the Taxonomy of Educational Objectives
4. California Test Bureau, California Test of Mental Maturity, Advanced, Los Angeles, 1957.
5. California Study Methods Survey, Grades 7 to 13, California Test Bureau, Del Monte Research Park, Monterey, 1966.