Football
Washington District Football Officials Association (WDFOA) - http://wdfoa.org/
An association of independent contractors that serve as football officials for junior high schools, high schools, and colleges in Maryland, Virginia, and Washington, DC.
Football at Refs.Org - http://football.refs.org/
The home for football officials - football officiating tips, football rules, football officiating mechanics, rules quizzes, discussion forums, workshops, and much more for high school football officials and NCAA college football officials.