1. Jim Collins on the Hedgehog Concept

https://www.jimcollins.com/media_topics/PersonalHedgehogConcept.html, https://www.jimcollins.com/concepts/the-hedgehog-concept.html 

2. Daniel Goleman, Emotional Intelligence (books available in your national language)
3. The Big Five Personality Model https://en.wikipedia.org/wiki/Big_Five_personality_traits
4. The Big Five Personality model https://www.verywellmind.com/the-big-five-personality-dimensions-2795422