"Getting to Yes" by Roger Fischer and William Ury

This is the first book I ever read on negotiating, and at the time I found it extremely good. However, since then, I have read both Shell's "Bargaining for Advantage" and Cialdini's "Influence", and found those two books immensely better than Getting to Yes, for a few different reasons.

Number of stories in Getting to Yes, the authors do not offer enough stories to burn the concepts into the reader's mind. I personally think stories are the best way to communicate something like negotiating.

Actual psychological concepts explained Getting to Yes is a summary of findings, and it never explains why certain things work. Without a deep understanding, it is not clear when the concepts work and when they don't. Especially in Influence, you really get to understand how to persuade someone by remembering the core psych concepts.