MBTI:
http://www.michaelcaloz.com/personality/ - excellent starting point for MBTI, also has the most accurate test.
https://www.careerplanner.com/8CognitiveFunctions/Cognitive-Functions-Simply-Explained.cfm - descriptions for the 8 cognitive functions.Enneagram:
https://www.enneagraminstitute.com - type descriptions, as well as a helpful set of pages on mistypes between types.
https://www.eclecticenergies.com/enneagram/ *THIS SITE HAS THE MOST ACCURATE TEST*
https://oceanmoonshine9.wordpress.com - instinctual variant descriptions and more enneagram info, also has mistype infowarning: these below are full books...
https://archive.org/details/PersonalityTypesUsingTheEnneagramForSelfDiscovery_201802/page/mode/2up
https://archive.org/details/TheWisdomOfTheEnneagram.TheCompleteGuideToPsychologicalAndSpiritualGrowthForTheN/mode/2uphttps//:personality-database.com - a personal favorite. the types of celebrities and fictional characters based on votes from users. usually the more votes, the more likely the typing is accurate (hence why i added the # of votes next to type here)
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kpop girl groups REAL personality types (MBTI + enneagram) (updated)
Non-Fictionsource: personality database and my own typing. any tritypes or instinctual variants are just a guess so please take them with a grain of salt.