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.
A pair of coaches from Nova Scotia did a conversation about coaching resources they like. One of them is this blog, and especially the Conversations series.
Back when COVID-19 driven stay-at-home recommendations/orders were really starting to take hold in the US in the latter part of March I went a little crazy. I decided to take
The book Messy, by Tim Harford, is a book that explores the value in not always being neat, orderly, and well-structured.
I presented at the 2019 AVCA Convention in Pittsburgh. Here's how you can get a recording of that presentation, whether you're an AVCA member or not.
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.