The book below was written nearly 15 years ago! It is Difficult Conversations by Stone, Patton, and Heen. Please take a look at the nice summary I found. I think you will find it timely and priceless!
This book, based on fifteen years of research at the Harvard Negotiation Project, walks you through a proven step-by-step approach for how to have better and less stressful outcomes from your most difficult conversations. It shows you how to prepare yourself; how to start the conversation without defensiveness; and how to keep it constructive and focused.