APA引文

(1988). The enneagram: Understanding yourself and the others in your life / Helen Palmer.

Chicago Style (17th ed.) Citation

The Enneagram: Understanding Yourself and the Others in Your Life / Helen Palmer. 1988.

MLA引文

The Enneagram: Understanding Yourself and the Others in Your Life / Helen Palmer. 1988.

警告：這些引文格式不一定是100％准確.