When I first started with the T I have now at our second session he gave me a copy of " Can I Look Now?" I still go back and read and look over it from time to time. Is great in showing the stages you go thru.
Another book I have is "The Multiple's Guild To Harmonized Family Living" by. Tammy Whitman & Susan Shore. It's a great book as well. It took several months for me to get it 4 years ago because it's out of print. But if you can find it, it's worth owning. Alot of it has to do with communication between alters. A couple of chapters are, Processing Dissatisfaction and Resolving Disputes and Working Through Crises. I've gotten a lot from these 2 chapters.
There are a number of good books out there. Just have to find what will help you the most.
Monty