How Popular Is American Football in Europe
NFL announces 5 teams that will play games in Europe next season: Who is making the trip? - The Athletic
N.F.L. Pulls the Plug on Its League in Europe - The New York Times
NFL Europe 2004, Koeln; Cologne Centurions - Frankfurt Galaxy; Mark
NFL Europe 2004, Frankfurt; Frankfurt Galaxy - Duesseldorf Rhein News Photo - Getty Images
NFL Europe Was Abandoned Far Too Soon
European League of Football - Wikipedia
The Top Four American Football Leagues in Europe
American Football in Europe – Europe's Elite