This book https://www.amazon.com/Complex-PTSD-.../dp/B00HJBMDXK
It was the first book about CPTSD I've read and it felt as if he was describing my own life. It finally made sense and I learned what my problem was, that I'm not crazy and it gave me courage to seek help. If you already know something about CPTSD there probably won't be much new stuff, but if you're a "beginner" in this topic it is very helpful.