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Sandra Maitri. "The Spiritual Dimension of the Enneagram." (New York: Tarcher/Putnam, 2000)
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2 |
Thomas G. Crane. "The Heart of Coaching." (San Diego: FTA Press, 2007)
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3 |
이은하. "청소년용 에니어그램 성격검사도구 개발 및 상담에의 활용". 순천향대학교 박사학위논문.(2008)
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4 |
Claudio Naranjo. "ENNEA-TYPE STRUCTURES: self-analysis for the seeker" (Nevada: GATEWAYS, 1990)
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5 |
Jerome Wagner. "The Ennagram Personality Style Scale." (Los Angeles: Western Psychological Services, 1999)
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6 |
Jerome Wagner. "Nine Lenses on the World: The Enneagram Perspective". (Illinois: NineLense Press, 2010)
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7 |
Randy L. DeSimone and David M. Harris. "Human Resource Development," (Harcourt Brace College Publishers: The Dryden Press, 1998)
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8 |
김응자."청소년 에니어그램 성격유형의척도의 개발 및 타당화". 숙명여자대학교 박사학위논문.(2008).
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9 |
Don. R. Riso, and Russ Hudson. "The Wisdom of The Enneagram." (New York: A Bantam Book, 1999)
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