USA Water Polo Rulebook
There is an official rule book published by USA water polo. You can find it on there website here
USA Water Polo Website
USA Water Polo is a non-profit organization operating under charter of the United States Olympic & Paralympic Committee ("USOPC"). The federation provides play opportunities for all ages, abilities and commitment levels throughout the United States, from sanctioning local tournaments to producing national championships to selecting and training U.S. Olympic Teams.
Collegiate Water Polo Association (CWPA)
The official website of College Water Polo. Provides rankings and information about all Varsity and Club teams throughout the nation. Weekly rankings are assigned to each Varsity program throughout their season.