The Enneagram: Spirituality It Is Not
- Description of the Enneagram and why it is not compatible with Catholic spirituality.
- http://www.catholicculture.org/docs/doc_view.cfm?recnum=2622&longdesc

The Enneagram: Psychic Babble
- The Enneagram is a growing source of controversy among Catholic professionals in the fields of education, counseling, and priestly formation.
- http://www.lhla.org/globalwatch/gwenneagram.htm

Enneagram
- Criticisms from a Christian perspective.
- http://www.saint-mike.org/Library/Occult/Enneagrm.html

Tell Me Who I Am, O Enneagram
- Criticism of the "enneagram industry" by Mitchell Pacwa, S.J., from the "Christian Research Journal", Fall 1991.
- http://www.iclnet.org/pub/resources/text/cri/cri-jrnl/web/crj0146a.html

Gurdjieff and the Enigmatic Enneagram
- Some general information on the enneagram from an Anglican point of view.
- http://www3.telus.net/st_simons/arm04.htm

The Enneagram Theory of Personality
- An essay from the St. Catherine Review asserting that the personality-typing theory is a fraud.
- http://www.aquinas-multimedia.com/catherine/enneagram.html

Skeptic's Dictionary: enneagram
- A skeptical perspective.
- http://skepdic.com/enneagr.html