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Sources:
https://www.enneagraminstitute.com/how-the-enneagram-system-works/
https://www.enneagraminstitute.com/type-descriptions/
https://www.enneagramworldwide.com/tour-the-nine-types/
https://www.researchgate.net/publication/289724121_The_Riso-Hudson_Enneagram_Type_Indicator_Estimates_of_Reliability_and_Validity
https://e-space.mmu.ac.uk/583471/
https://www.sciencedirect.com/science/article/pii/S0263237312001442
https://books.google.com/books?isbn=0826177697
https://www.nbcnews.com/better/pop-culture/why-do-we-need-personality-tests-tell-us-who-we-ncna914371
https://www.psychologytoday.com/us/blog/presence-mind/201801/looking-self-knowledge-in-all-the-wrong-places
https://taylorlab.psych.ucla.edu/wp-content/uploads/sites/5/2014/10/1994_Positive-Illusions-and-Well-Being-Revisited_Separating-Fact-from-Fiction.pdf
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1467-6494.1992.tb00970.x
https://www.tandfonline.com/doi/abs/10.1080/15265161.2013.776130?journalCode=uajb20