gridiron football summary
Adrian Peterson, Biography & Accomplishments
The NFL Encyclopedia (Sports Encyclopedias): Flynn, Brendan
Football (American) - New World Encyclopedia
George Blanda, Biography, Stats, Hall of Fame, & Facts
Soccer - New World Encyclopedia
Football (American) - New World Encyclopedia
Dan Marino, Biography, Stats, Records, & Facts
Football player - Wikipedia
World Football League Encyclopedia: Maher, Tod, Speck, Mark
Barry Sanders, Biography, Stats, & Facts
National Football League - Wikipedia