Maddi, S. R. (1989). Personality theories: A comparative analysis (5th ed.). Dorsey Press.
Lua i Stíl Chicago (17ú heag.)Maddi, Salvatore R. Personality Theories: A Comparative Analysis. 5th ed. Chicago, Ill: Dorsey Press, 1989.
Lua MLA (9ú heag.)Maddi, Salvatore R. Personality Theories: A Comparative Analysis. 5th ed. Dorsey Press, 1989.
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