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Omnibus Personality Inventory ( OPI) is a nonprojective personality measure published in 1968 by Paul Heist and George Yonge
Heist, P, & Yonge, G (1968). Omnibus Personality Inventory - Form F manual.
Cope, R.G. (1968) Selected Omnibus Personality Inventory scales and their relationship to a colleges attrition. Educational and Psychological Measurement,Vol. 28, No. 2, 599-603. DOI: 10.1177/001316446802800252
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