Rulebook, Casebook, Approved Bat List, Inappropriate Bat Form, Major Rule Changes, Incident Form, Protest Form, etc:
https://www.ncaa.org/sports/2013/12/2/softball-rules-of-the-game.aspx
Umpire Manual:
The Infamous, but consolidated, "Notes from Vickie". (Since these are not in the Rules, do they or do they not have any grounds in deciding a protest? By definition, no. But we're stuck with them. And tested on them):