* The Wildflowers (1979)
* The Moonbeamers (1981)
* The Stargazers (1983)
* The Dreamweavers (1985)
* The Suncatchers (1987)
* The Earthkeepers (1989)
* The Skydancers (1991)
* The Windwalkers (1993)
* The Firestarters (1995)
* The Waterbearers (1997)
Non-Fiction
* The Enneagram: A Guide to Self-Discovery (1992)
* The Enneagram Workbook (1994)
* The Enneagram in Love and Work (1997)
* The Enneagram Personality Types: A Guide for Working Together (2000)
* The Enneagram: A User's Guide (2002)
* The Enneagram: A Path to Self-Understanding (2005)
* The Enneagram: A Guide to Your Personality and Spiritual Growth (2008)
* The Enneagram: A User's Guide (2011)
* The Enneagram: A Guide to Self-Discovery (2014)
Children's Books
* The Little Flower That Wouldn't Give Up (1984)
* The Little Tree That Couldn't Stand Still (1986)
* The Little Bird That Wouldn't Fly (1988)
* The Little Fish That Wouldn't Swim (1990)
* The Little Star That Wouldn't Shine (1992)
* The Little Planet That Couldn't Find Its Way (1994)
* The Little Sun That Wouldn't Rise (1996)
* The Little Moon That Wouldn't Set (1998)
* The Little Wind That Wouldn't Blow (2000)
* The Little Fire That Wouldn't Burn (2002)