MLS' parity compared to top European soccer leagues is proving to be a weakness - The Athletic
How Far Behind are MLS Teams from European Clubs? - Back Sports Page
How Far Behind are MLS Teams from European Clubs? - Back Sports Page
Can MLS players transfer to Europe? - AS USA
MLS ranked 29th strongest league in the world, per Opta
MLS teams and their closest match in strength in Europe [OC with 538.com data] : r/MLS
Chart: The Clubs Making Long-Awaited Champions League Returns
MLS is Back Tournament draw: Players, coaches and GMs react to groups
Sporting Kansas City - Wikipedia
MLS teams crash the world's 'top 50' most valuable clubs, with LAFC ranked 16th with $900M valuation