Rules of Tennis is the official rules of tennis as determined by the International Tennis Federation, of which the United States Tennis Association is a member. This handy booklet includes USTA Comments, which clarify certain rules and provide examples, and The Code, which contains the "unwritten" rules under which tennis is played. $3.50
 
Friend at Court is the book of rules and regulations under which tennis is played in the United States. It is recommended reading for players, parents, coaches, teachers, tournament directors, league officials and anyone who wants a finer understanding of the game. This wire-bound book includes the ITF Rules of Tennis, USTA Regulations and The Code: The Players' Guide to Fair Play and the Unwritten Rules of Tennis. $12