I would strongly recommend the book Crucial Conversations[1] in this space. I first came across it in management training I took and have recommended it to everyone: my parents, my siblings, friends who are exploring management or struggling with a relationship. It takes the approach that all you really have control over is yourself and the way you approach the conversation--how do you make it a safe space while still talking about the disagreement in a non-threatening way.
[1]: https://www.amazon.com/Crucial-Conversations-Talking-Stakes-...
1. The Making of a Manager (https://www.amazon.com/Making-Manager-What-Everyone-Looks-eb...)
2. The Manager's Path (https://www.amazon.com/Managers-Path-Leaders-Navigating-Grow...)
3. Crucial Conversations (https://www.amazon.com/Crucial-Conversations-Talking-Stakes-...)
4. The Coaching Habit (https://www.amazon.com/Coaching-Habit-Less-Change-Forever-eb...)
5. The Five Dysfunctions of a Team (https://www.amazon.com/Five-Dysfunctions-Team-Leadership-Len...)
I'm still due to read High Output Management (https://www.amazon.com/High-Output-Management-Andrew-Grove-e...) and Extreme Ownership (https://www.amazon.com/Extreme-Ownership-U-S-Navy-SEALs-eboo...).