APA citiranje

Aspell, P. J., & Aspell, D. D. (1997). The enneagram personality portraits: Enhancing professional relationships. Jossey-Bass.

Chicago Style (17th ed.) Citation

Aspell, Patrick J., and Dee Dee Aspell. The Enneagram Personality Portraits: Enhancing Professional Relationships. San Francisco: Jossey-Bass, 1997.

MLA citiranje

Aspell, Patrick J., and Dee Dee Aspell. The Enneagram Personality Portraits: Enhancing Professional Relationships. Jossey-Bass, 1997.