1. Anastasi, A. Psychological testing. New York: Macmillan, 1976.
2. Bellanca, J. A. Grading. Washington, D.C: National Education Association, 1977.
3. Bloom, B. S. (Ed.). Taxonomy of educational objectives (Vol. 1): Cognitive domain. New York: McKay, 1956.
4. Cronbach, L. J. Essentials of psychological testing. New York: Harper & Row, 1970.
5. Denton, J. J., & Henson, K. T. Mastery learning and grade inflation. Educational Leader, 1979, 37, 150–152.