I have read a lot before coming to holacracy and I don't know that it relates directly to holacracy practice but just figured I'd share.
"The Visionary Director" by Margie Carter and Deb Curtis
Vital Smarts - "Crucial Conversations" and "Crucial Accountability"
"What Motivates Me" by Adrian Gostick and Chester Elton
"Nonviolent Communication" by Marshall Rosenberg
Sounds like a awesome project.