Duffy, K. G. e. (1996). Personal growth and behavior 96/97 (16th ed.). Dushkin.
Lua i Stíl Chicago (17ú heag.)Duffy, Karen G. ed. Personal Growth and Behavior 96/97. 16th ed. Connecticut: Dushkin, 1996.
Lua MLA (9ú heag.)Duffy, Karen G. ed. Personal Growth and Behavior 96/97. 16th ed. Dushkin, 1996.
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