Mexico's Liga MX cancels rest of soccer season - Los Angeles Times
Major League Soccer: How Diverse is the Growing North American Sports League? - Insight
NASL cancels 2018 season: Impacts on league, US soccer
Four players suspended after hostile soccer game between USA and Mexico
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N.W.S.L. Cancels Schedule and Removes Commissioner Lisa Baird - The New York Times
North American Soccer League (2011–2017) - Wikipedia
Major League Soccer - Wikipedia
US women's soccer games now generate more revenue than men's
NASL cancels 2018 season - RSL Soapbox