Each of the publications below offers much in the way of descriptive theory and prescriptive analysis for anyone seeking to improve her awareness of negotiation dynamics and her own performance as a negotiator.
Designing Systems and Processes for Managing Disputes, by Nancy H. Rogers, Robert C. Bordone, Frank E.A. Sander, Craig A. McEwen (2019)
Difficult Conversations: How to Discuss What Matters Most, by Douglas Stone, Bruce Patton, and Sheila Heen (2010)
3-D Negotiation: Powerful Tools to Change the Game in Your Most Important Deals by David Lax and James Sebenius (2007)
Other regular publications worth looking at:
Harvard Negotiation Law Review: A Multidisciplinary Journal on Dispute Resolution, published annually by the Harvard Negotiation Law Review at Harvard Law School.
Dispute Resolution Magazine: published quarterly by the American Bar Association Section on Dispute Resolution; the largest circulation magazine in the conflict resolution field.
Negotiation Briefings: Published monthly by the Program on Negotiation at Harvard Law School.