Aspell, P. J., & Aspell, D. D. (1997). The enneagram personality portraits: Enhancing professional relationships. Jossey-Bass.
Chicago Style (17th ed.) CitationAspell, Patrick J., and Dee Dee Aspell. The Enneagram Personality Portraits: Enhancing Professional Relationships. San Francisco: Jossey-Bass, 1997.
MLA citiranjeAspell, Patrick J., and Dee Dee Aspell. The Enneagram Personality Portraits: Enhancing Professional Relationships. Jossey-Bass, 1997.
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