TV ratings down, team revenues up: have protests really hurt the NFL?, NFL
From 1960s Football Boycotts to NFL National Anthem Protests
NFL Players Urge League to Stand Against Racism in Powerful Video
Trump's reaction to NFL protests shows who should really be fired - WHYY
Why the NFL Put Its New Kneeling Policy on Hold – Rolling Stone
PHOTOS: NFL Players kneel in protest during the National Anthem
How high school football coaches plan to handle national anthem protests
Why do NFL players kneel during the national anthem? - Sports Illustrated
The History of NFL Player Protests During the National Anthem - WSJ