APA (7th ed.) Citation

RISO & Hudson. (1996). Personality types: Using the enneagram for self-discovery. New York Houghton Mifflin 1996.

Chicago Style (17th ed.) Citation

RISO and Hudson. Personality Types: Using the Enneagram for Self-discovery. New York: New York Houghton Mifflin 1996, 1996.

MLA (8th ed.) Citation

RISO and Hudson. Personality Types: Using the Enneagram for Self-discovery. New York Houghton Mifflin 1996, 1996.

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