I've recently been trying to improve my negotiating skills by reading two books: You Can Negotiate Anything by Herb Cohen and Influence: The Psychology of Persuasion by Robert Cialdini.
You Can Negotiate anything is a short book that gives tips and pointers and gives examples of negotiating tactics.
Influence is a fascinating book by a psychologist that supports every major point by describing various psychological findings and major events that exemplify that point.
The first book is more of a how-to book and the second is more of a why-it's-the-case book. I found both to be valuable in helping me recognize negotiating tactics, which hopefully makes me less vulnerable to being unconsciously influenced.
