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2.
Birney, R. C. Referred to by D. C. McClelland, " Methods of Measuring Human Motivation." Unpublished dittoed paper , Harvard University, 1957.
3.
Edwards, A. L.Edwards Personal Preference Schedule. New York: Psychological Corporation, 1954.
4.
Lowell, E. L. "The Effect of Need for Achievement on Learning and Speed of Performance." Journal of Psychology, XXXIII ( 1952), 31-40.
5.
McClelland, D. C., Atkinson, J. W., Clark, R. A., and Lowell, E. L.The Achievement Motive. New York: Appleton-Century-Crofts, 1953.
6.
Morgan, H. H. "An Analysis of Certain Structured and Unstructured Test Results of Achieving and Non-Achieving High Ability College Students." Unpublished doctor's dissertation, University of Minnesota, 1951.
7.
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