1. Anastasi, Anne (1950), "The Concept of Validity in the Interpretation of Test Scores," Educational and Psychological Measurement, 10, 67–68.
2. — (1982), Psychological Testing, (5th Ed.)/ New York: MacMillan Publishers.
3. Campbell, D.T. and D. Fiske (1959), "Convergent and discriminant Validation by the Multitrait-multimethod Matrix," Psychological Bulletin, 56, 81–105.
4. Churchill, Gilbert A. (1987) , Marketing Research: Methodological Foundations, (4th Ed.), Chicago: The Dryden Press.
5. Clayson, Dennis E. (1989), "Halo Effects in Student Evaluation of Faculty: A Question of Validity," Marketing: Positioning for the 1990s, Proceedings of the Southern Marketing Association, New Orleans, 271–275.