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2. Barr, A. S. (1959). ?The Appraisal of Teaching in Large Universities: A Summary of Remarks.? In: The Appraisal of Teaching in Large Universities. Ann Arbor: University of Michigan.
3. Barzum, Jacques. (1954). Teacher in America. Garden City, New York: Doubleday. Chapter 14.
4. Blegen, Theodore and Cooper, Russell. (1950). The Preparation of Teachers. Washington D.C.: American Council on Education, p. 123.
5. Brown, James and Thornton, James. (1971). College Teaching: A Systematic Approach. New York: McGraw-Hill.