If Gold is Our Destiny, by Sean Murray, takes readers back in time to tell the story of the 1984 Olympic gold medal winning USA men.
Leaders Eat Last is a book about creating strong team environments and the things that contribute to them, and work against them.
Stop Competing and Start Winning is a book about coaching beyond the practices and matches. It's about building and running a program.
It's worth reading the thoughts and advice of coaches with tons of experience and success. This book from Alex Ferguson is a good add to your list.
The book Messy, by Tim Harford, is a book that explores the value in not always being neat, orderly, and well-structured.
The Science of Volleyball Practice Development and Drill Design has some good information based on motor learning concepts, but is a very difficult read.
The Little Book of Talent features a bunch of really interesting things to think about as a coach, in a very consumable fashion.
The Art of Volleyball Hitting by John L. Bowman is a quite thorough discussion of hitting aimed at players, but I think you can find far better resources.