Riso, D. R., & Hudson, R. (1999). The wisdom of the enneagram: The complete guide to psychological and spiritual growth for the nine personality types. Bantam Books.
Cita Chicago Style (17a ed.)Riso, Don Richard, y Russ Hudson. The Wisdom of the Enneagram: The Complete Guide to Psychological and Spiritual Growth for the Nine Personality Types. New York: Bantam Books, 1999.
Cita MLA (8a ed.)Riso, Don Richard, y Russ Hudson. The Wisdom of the Enneagram: The Complete Guide to Psychological and Spiritual Growth for the Nine Personality Types. Bantam Books, 1999.
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