APA (7th ed.) Citation

Riso & Hudosn. (1996). Personality types: Using the enneagram for self-discovery (Revised edition.). Houghton Mifflin Company.

Chicago Style (17th ed.) Citation

Riso and Hudosn. Personality Types: Using the Enneagram for Self-discovery. Revised edition. Boston: Houghton Mifflin Company, 1996.

MLA (8th ed.) Citation

Riso and Hudosn. Personality Types: Using the Enneagram for Self-discovery. Revised edition. Houghton Mifflin Company, 1996.