And Be Very Entertained While Doing So!
Never Split the Difference - Negotiating As If Your Life Depended On It by Chris Voss
Fantastic read/listen about negotiation. One of the best communications books I've ever read. I highly recommend the Audible version, which if you become a new member you can get for free here.
The author, Chris Voss has used his many years of experience in international crisis and high-stakes negotiations to develop a unique program and team that applies these globally proven techniques to the business world.
During Chris’s 24 year tenure in the Bureau, he was trained in the art of negotiation by not only the FBI but Scotland Yard and Harvard Law School.