Barr, A.S. "The Measurement and Prediction of Teaching Efficiency: A Summary of Investigations." Journal of Experimental Education16: 203-83; June 1948.
2.
Barr, A.S. "Wisconsin Studies of the Measurement and Prediction of Teacher Effectiveness: A Summary of Investigations." Journal of Experimental Education30: 1-155; September 1961.
3.
Klausmeier, Herbert J., and Goodwin , William.Learning and Human Abilities: Educational Psychology. Second edition. New York: Harper and Row, 1966.
4.
Walberg, Herbert J. "Scholastic Aptitude, the National Teacher Examination, and Teaching Success." Journal of Educational Research61: 129-31; November 1967.