Getting to Yes by Roger Fisher, William Ury

Based on the work of the Harvard Negotiation Project, this book outlines the key point of how to negotiate effectively so that both parties can reach a mutually acceptable agreement without being adversarial. The authors have four key points: Separating the people from the problem, focusing on each party's interests instead of their positions, work together to create mutually beneficial options, and how to deal with those who are more powerful or not willing to negotiate fairly. The authors use examples from both famous negotiations and day-to-day interactions to illustrate their techniques. 

This is an old classic in the library of business self-help books, but there is a reason has gone through multiple editions.  The advice is common sense and really useful.  The writing is clear, and the authors use interesting examples.  Since it is an older book, younger readers might not remember some of the famous examples, like the Iran Hostage Crisis, or the Egypt Israel treaty of 1979, but the authors explain them well enough to still be illustrative. In this third edition, the authors include a few comments about how the internet has influenced negotiations, but mostly to warn people not to try to negotiate solely via texts or emails. I checked out the book because of some upcoming negotiation I will need to do at work, and I felt like I gained some good ideas from it. (240, 2011)