Region 418 AYSO Links:
Refscheduler
Ref Training
How to Register for a Course
AYSO Region 418 Local Policies
Region 418 Referee Mentor Request Form

Laws of the Game (LOTG):
FIFA Laws of the Game
Helpful Hints on Body Language, Communication and Use of the Whistle are found on pages 186-187.
Important information about Offside starts on page 193.
Mobile Version

National AYSO Links:
AYSO National Referee Resources 
The AYSO Whistle Blog

Third Party Sites:
Ask the Ref

Helpful Video Sites:
Build-out Line Review
US Soccer Federation Referee Program