九型人格测试，又称为Enneagram Personality Typing System，是一个用于个人发展和自我认识的心理学量表。它基于一个古老的人格分类系统，将人格特质分为九种基本类型，每种类型都有其独特的视角和行为模式。这九种人格类型涵盖了人类性格的广泛谱系，可以帮助人们识别自己最深层的动机、恐惧和欲望。
以下是一些关于九型人格理论的研究论文文献，供您参考：
1.Riso, D. R., & Hudson, R. (1999). The wisdom of the enneagram: The complete guide to psychological and spiritual growth for the nine personality types. Bantam.
2.Lapid-Bogda, G. (2008). Bringing out the best in everyone you coach: Use the enneagram system for exceptional results. McGraw-Hill.
3.Frick, J. (2011). Personality typologies in old age: A critical review. Aging & mental health, 15(5), 539-553.
4.Ayrault, M. (2015). The Enneagram Intelligences: Understanding Personality for Effective Teaching and Learning. Australian Journal of Adult Learning, 55(1), 113-135.
5.Esmaeili, J., Ghasemzadeh, H., & Nikravesh, A. (2016). Studying the Impact of Personality Types on Students' Willingness to Communicate. Mediterranean Journal of Social Sciences, 7(3), 207-214.