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https://en.wikipedia.org/wiki/Enneagram_of_Personality
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2 |
Helen Palmer, The Enneagram:Understanding Yourself and the Others In Your Life, pp. 36, HarperOne, 1991.
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3 |
Don Richard Riso, Russ Hudson, Understanding the Enneagram: The Practical Guide to Personality Types. Houghton Mifflin Harcourt. ISBN 978-0-618-00415-7, 2000.
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4 |
Sandra Maitri, The Spiritual Dimension of the Enneagram, pp. 263-264, TarcherPerigee, 2000.
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5 |
https://www.enneagraminstitute.com/the-traditional-enneagram
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6 |
Achieving True Success, IACC, 2000.
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7 |
Christopher L. Heuertz, The Sacred Enneagram: Finding Your Unique Path to Spiritual Growth, Zondervan, 2017.
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8 |
https://enneagramexplained.com/enneagram-levels-of-development/
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9 |
Hook, Joshua N.; Hall, Todd W.; Davis, Don E.; Tongeren, Daryl R. Van; Conner, Mackenzie, "The Enneagram: A systematic review of the literature and directions for future research," Journal of Clinical Psychology, 77 (4), pp. 865-883, https://doi:10.1002/jclp.23097, 2021.
DOI
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10 |
Beatrice Chestnut, The Complete Enneagram: 27 Paths to Greater Self-Knowledge, She Writes Press, 2013.
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11 |
Clarke Peter, Encyclopedia of new religious movements, Taylor & Francis, ISBN 0-203-48433-9, 2004.
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