Aschenbrenner, Ralph, "A Study of the Reliability of one Type of Discrimination Index for Test Items," Unpublished Master's Thesis in Education, State University of Iowa, 1949.
2.
Carter, Harold D. "How Reliable are the Common Measures of Difficulty and Validity of Objective Test Items? " Journal of Psychology, XIII (1942), 31-39.
3.
Davis, Frederick B. "Notes on Test Construction: The Reliability of Item-Analysis Data." Journal of Educational Psychology, XXXVII (1946), 385-390.
4.
Flanagan, John C. "General Considerations in the Selection of Test Items and a Short of Estimating the Product-Moment Coefficient from Data at the Tails of the Distribution." Journal of Educational Psychology, XXX (1939), 674-680.
5.
Gibbons, Charles C. "The Predictive Value of the Most Valid Items of an Examination." Journal of Educational Psychology, XXXI (1940), 616-21.
6.
Kelley, T. L. "The Selection of Upper and Lower Groups for the Validation of Test Items." Journal of Educational Psychology, XXX (1939), 17-24.