Books
Beginner Books :
The Enneagram for Moms — Beth McCord
The Enneagram Type 9 — Beth McCord
The Enneagram Made Easy — Renee Baron & Elizabeth Wagele
The Road Back to You — Ian Morgan Cron & Suzanne Stabile
The Enneagram & you —Elizabeth Wagele.
The Honest Enneagram — Sarajane Case, co-written with Chase McNary.
Intermediate :
The Path Between Us — Suzan Stabile
The Enneagram Type 9 — Beth McCord
Becoming Us — Beth & Jeff McCord
Advanced :
The Enneagram, Relationships, and Intimacy — Dr. David Daniels & Suzanne Dion
The Wisdom of the Enneagram — Don Richard Riso & Russ Hudson
The Complete Enneagram: 27 Paths to Greater Self-Knowledge — Beatrice Chestnut