APA (7th ed.) Citation

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.

Chicago Style (17th ed.) Citation

Riso, Don Richard, and 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.

MLA (8th ed.) Citation

Riso, Don Richard, and Russ Hudson. The Wisdom of the Enneagram: The Complete Guide to Psychological and Spiritual Growth for the Nine Personality Types. Bantam Books, 1999.

Warning: These citations may not always be 100% accurate.