If you are able to suss a message from fiction, these books are perfect. A (maybe the) central theme in the series is an examination of the muddied qualities that define good leadership. What does it mean to be a good (effective) leader? What does it mean to be a good (moral) leader? What does it take to be both simultaneously? When we negotiate as leaders, what do the people "below" us gain and lose?
Fiction is such an underrated source of knowledge because people tend to forget that the lessons we learn from fantasy, general fiction, or science fiction are often derived through critical thought and the answers are not laid bare for us. The reward in putting in the effort to uncover the answers though is that the lessons we learn stick with us and are more integrated into our worldview.
Never Split the Difference: Negotiating As If Your Life Depended On It
Difficult Conversations by Bruce Patton, Douglas Stone, and Sheila Heen
It always pops up on book questions.
I also found “Crucial conversations tools for talking when stakes are high” by Kerry Patterson good.
The mind and heart of the negotiator.