Source: Based on O.P John, "The `Big Five' Factor Taxonomy: Dimensions of Personality in the Natural Language and in Questionnaires," in L.A. Pervin (ed.), HANDBOOK OF PERSONALITY THEORY AND RESEARCH (New York: Guilford Press, 1990), pp. 66-100; and D.L. Formy-Duval, J.E. Williams, D.J. Patterson, and E.E. Fogle, "A `Big Five' Scoring System for the Item Pool of the Adjective Check List," Journal Of Personality Assessment, Vol. 65, 1995, pp. 59-76.
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