Cheshire, L., Saffir, M. , and Thurstone, L. L.Computing Diagrams for the Tetrachoric Correlation Coefficient . Chicago: University of Chicago Bookstore , 1938.
2.
Guilford, J. P.Psychometric Methods. (Second Edition) New York: McGraw-Hill, 1954.
3.
Guilford, J. P.Fundamental Statistics in Psychology and Education. (Third Edition) New York: McGraw-Hill, 1956.
4.
Guilford, J. P. and Zimmerman, W. S."Fourteen Dimensions of Temperament." Psychological Monographs, LXX ( 1956), Whole No. 417.
5.
Palmer, G. A., Jr. and McCormick, E. J. "A Factor Analysis of Job Activities." Journal of Applied Psychology, XLV ( 1961), 289-294.
6.
Willis, R. H. "Manipulation of Item Marginal Frequencies by Means of Multiple-Response Items." Psychological Review, LXVII (1960),32-50.