Richard Rohr and The Enneagram Secret, by Don & Joy Veinot and Marcia Montenegro (MCOI Publishing). Click here to order the book and other material (audio & video) from the authors.
Midwest Christian Outreach online conference on the Enneagram (various speakers).
Stolen Identity: Enneagram with Pamala Frost.
How Should Christians Think about the Enneagram? A Conversation with Dr. Chris Berg.