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- "Humanmetrics, Jung typology Test;" www.humanetrics.com/cgi-win/Jtypes1.htm; October 5, 2002
- Spellgrove, Engle. Psychology: It’s Principles and Applications. New York, Harcourt Brace Jovanovich, Inc. 1979
- “The Ultimate Theory of Personality;” www.ship.edu/~cgboeree/conclusions.html; October 5, 2002
- “Psychology Online Resource Central;” www.psych-central.com/; October 5, 2002
