Why haven't more European soccer stars become NFL kickers?, NFL
Is European Football Becoming American Soccer?
American Soccer vs. European Football: Why are we so behind? - The Cuestonian
European Super League soccer: NFL and college football inspired Champions League rebels.
US soccer stars in Europe: seven players to watch this season, USA
Understanding American Soccer vs. European Football: Same Sport, Many Differences
USMNT players in Europe: Full list of American soccer stars abroad in England, Italy, and other countries
European trainers coming to newly soccer-happy U.S.
Understanding American Soccer vs. European Football: Same Sport, Many Differences
How the financial structure of U.S. men's soccer limits it- Marketplace
How a Soccer Star Is Made - The New York Times