Ferrett, S. K. (2010). Peak performance: Success in college and beyond (7th ed.). New York: McGraw-Hill.
Παραπομπή Chicago StyleFerrett, Sharon K. Peak Performance: Success in College and Beyond. 7th ed. New York: McGraw-Hill, 2010.
Παραπομπή MLAFerrett, Sharon K. Peak Performance: Success in College and Beyond. 7th ed. New York: McGraw-Hill, 2010.
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