Tohutoro APA (7th ed.)
Ryckman, R. M. (1989). Theories of personality (3rd ed.). Brooks/Cole Publishing Company.
Tohutoru Kātū Chicago (17th ed.)
Ryckman, Richard M. Theories of Personality. 3rd ed. California: Brooks/Cole Publishing Company, 1989.
Tohutoro MLA (9th ed.)
Ryckman, Richard M. Theories of Personality. 3rd ed. Brooks/Cole Publishing Company, 1989.
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