The Group Personality Projective Test (GPPT)

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Cassel R. N. , & Harriman L. B. A comparative analysis of personality and Ego Strength Test scores for in-prison, N-P, and typical subjects. J. educ. Res., 1959, 53, 43–52.

Cassel R. N. , & Kahn T. C. Development and standardization of the Group Personality Projective Test. J. proj. Tech., 1958, 22, 267–271.

Cassel R. N. , & Kahn T. C. The Group Personality Projective Test. Missoula: Psychological Test Specialists, 1960.

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