NFL: Why did NFL Europe fail?
Awesome assembly Central European Football League - CEFL
American Football in Europe
How Has American Football Thrived In Europe - Warrington Worldwide
NFL Europe 2004, Frankfurt; Frankfurt Galaxy - Duesseldorf Rhein News Photo - Getty Images
Why American Football Lost
American football - Wikipedia
NFL Germany: Dusseldorf, Frankfurt and Munich named as three finalist cities in search for host partner, NFL News
The key questions shaping the future of the NFL in Europe - ESPN