NFL players protest during national anthem, drawing criticism from Trump
Race and football: why NFL owners are so scared of Colin Kaepernick - Vox
NFL players, coaches, owners kneel, lock arms during national anthem - ESPN
Pro and Con: Kneeling during the National Anthem
The Indignity of the N.F.L.'s New National-Anthem Policy
NFL: Several players kneel for anthem, some teams stay in locker room
NFL Sees Six Teams Remain In Locker Room For National Anthem – Deadline
National anthem protest and Sept. 11: Why Brandon Marshall lost a sponsor
NFL National Anthem Protests—6 Questions Explain the History
Trump Cheers the NFL Fans Who Booed Players Taking a Knee During National Anthem
How NFL national anthem protests have evolved since Kaepernick