Ferrett, S. K. (2012). Peak performance: Success in college and beyond (8th ed.). New York: McGraw-Hill.
Dyfyniad Arddull ChicagoFerrett, Sharon K. Peak Performance: Success in College and Beyond. 8th ed. New York: McGraw-Hill, 2012.
Dyfyniad MLAFerrett, Sharon K. Peak Performance: Success in College and Beyond. 8th ed. New York: McGraw-Hill, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.