1. , , , & (Eds.). (1956) Taxonomy of Educational Objectives: The Classification of Educational goals. Handbook I: Cognitive domain. New York: David McKay.
2. Possible interpretive problems in analyses using group means as the experimental unit.
3. , , & (1972). Teaching Improvement Kit. Los Angeles: Instructional Appraisal Services.
4. The effects of preservice teacher's cognitive questioning level and redirecting on student science achievement