Here's a list of resources to help you learn more about group process. Below you will find a series of blog posts I have written, links to a few pdfs I have created to help you think about process, and a couple of books that are helpful.

A series of blog posts I wrote on group process: Discontent With Process and Content

Group problem solving: SOLVED

Conducting efficient meetings: POTENT Meetings

The best book on the subject: Process Consultation Revisited

Also a very good book: Intervention Skills