NFL permitting players to display social justice messages on helmets this season - The Boston Globe
McKennie joined by PL, USMNT, Bundesliga, NBA players in protest video - NBC Sports
American football – News, Research and Analysis – The Conversation – page 1
When NFL players protest racism, some critics see only 'millionaire athletes' who should be silent - The Washington Post
The Latest: Clemson football players lead march on campus
Taking the knee - Wikipedia
Pressure Mounts Against Schools' Confederate Ties
Taking the knee in football: why this act of protest has always been political
Premier League drops Black Lives Matter badge from shirts for own campaign, Premier League
Apologies, Protests and Rebellion: Inside the NFL's 72-Hour Awakening - WSJ