Ferrett, S. K. (1997). Peak performance: Success in college & beyond (2nd ed.). Irwin Mirror Press.
Lua i Stíl Chicago (17ú heag.)Ferrett, Sharon K. Peak Performance: Success in College & Beyond. 2nd ed. Chicago: Irwin Mirror Press, 1997.
Lua MLA (8ú heag.)Ferrett, Sharon K. Peak Performance: Success in College & Beyond. 2nd ed. Irwin Mirror Press, 1997.
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