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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRiso, Don Richard, और 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.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRiso, Don Richard, और 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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