APA-čujuhus (7. p.)
Rohr, R., Ebert, A., & Heinegg, P. (2007). The Enneagram: A Christian Perspective. Crossroad.
Chicago-čujuhus (17. p.)
Rohr, Richard, Andreas Ebert, juo Peter Heinegg. The Enneagram: A Christian Perspective. Nueva York, EUA: Crossroad, 2007.
MLA-čujuhus (9. p.)
Rohr, Richard, et al. The Enneagram: A Christian Perspective. Crossroad, 2007.
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