Hi spaI, here is a book I found useful:
Diffficult Conversations: How to discuss what matters most

I found this book very useful for improving both workplace and personal conversations and interactions. The central example used throughout the book is about a friendship/business relationship between 2 people that is suffering from one miscommunication after another. As I recall, one man is doing contract work for another man, his friend. This example is used to illustrate a lot of "do's and don'ts" and how to have those difficult conversations to work out your troubles.