The NFHS rules books for ALL high school sports in the U.S. are available for purchase from
http://www.nfhs.org
The Laws of the Game, and other supplementary booklets, which govern competitive club soccer play both in the US and around the world can be obtained from the US Soccer Federation at
http://www.ussoccer.com
For NFHS soccer there is only one Rules book.
For USSF soccer you will want:
1. FIFA Laws of the Game
2. Advice to Referees on the Laws of the Game
3. Laws of the Game Made Easy
4. Guide to Procedures for Referees, Assistant Referees and Fourth Officials
Best wishes