Here are the rules for your perusal:

THE CODE, (Every Captain and player should carefully read this at least once. These are the rules we play under when no official is present, which is essentially 100% of the time.)

USTA Official Rules of Tennis (from "Friend at Court, 2007"

2007 Sectional Rules and Regulations ("Captains Handbook")

2007 USTA LEAGUE RULEBOOK ("National League Tennis Rules")

Regulations page on SCTA site. Some of the above links also appear here.