Brogden, H. E.Effect of bias due to difficulty factor in product-moment item intercorrelations on the accuracy of estimation of reliability by the Kuder-Richardson Formula No. 20. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1946, 6, 517-520. (a)
2.
Brogden, H. E.Variation in test validity with variation in the distribution of item difficulties, number of items, and degrees of their intercorrelation. Psychometrika. 1946, 11, 197-214. (b)
3.
Cronbach, L. J. and Azuma, H.Internal-consistency reliability formulas applied to randomly sampled single-factor tests: An empirical comparison. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1962, 22, 645-666.
4.
Cronbach, L. J., Schönemann, R., and McKie, D.Alpha coefficients for stratified-parallel tests. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1965,25,291-321.
5.
Lawley, D.On problems connected with item selection and test construction. Proceedings of the Royal Society of Edinburgh, 1943, 61-A, Part 3, 273-287.
6.
Lord, F. M.Sampling fluctuations resulting from the sampling of test items. Psychometrika, 1955, 20, 1-22.
7.
Shoemaker, D. M. and Osburn, H. G.An empirical study of generalizability coefficients for unmatched data. British Journal of Mathematics and Statistical Psychology, 1968, 21, 239-246.
8.
Tucker, L.Maximum validity of a test with equivalent items. Psychometrika, 1946, 11, 1-13.