Bottenberg, R. A. and Christal, R. E.An Iterative Technique for Clustering Criteria which Retains Optimum Predictive Efficiency. Lackland Air Force Base, Texas: Personnel Laboratory, Wright Air Development Division, Air Research and Development Command, USAF, March, 1961. (Technical Note WADD-TN-61-30)
2.
Cronbach, L. J. and Gleser, Goldine C. "Assessing Similarity Between Profiles." Psychological Bulletin, L ( 1953 ), 456-473.
3.
Helmstadter, G. C. "An Empirical Comparison of Methods for Estimating Profile Similarity." EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, XVII ( 1957), 71-82.
4.
Rao, C. R.Advanced Statistical Methods in Biometric Research. New York: John Wiley & Sons, 1952.
5.
Sawrey, W. L., Keller, L. and Conger, J. J. " An Objective Method of Grouping Profiles by Distance Functions and Its Relation to Factor Analysis." EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT , XX (1960), 651-674.
6.
Thorndike, R. L., Hagen, Elizabeth P., Orr, D. B. and Rosner, B.An Empirical Approach to the Determination of Air Force Job Families. Lackland Air Force Base, Texas: Air Force Personnel and Training Research Center, August 1957 (Technical Report AFPTRC-TR-57-5 )
7.
Ward, J. H., Jr. Hierarchical Grouping To Maximize Payoff. Lackland Air Force Base, Texas: Personnel Laboratory, Wright Air Development Division, Air Research and Development Command, USAF, March 1961. (Technical Note WADD-TN-61-29)
