Are NFL Players Required to Stand on the Field During the National Anthem?
What Is the U.S. Flag Code?
Hey, NFL, I'm an active duty Army officer and your new anthem rule leaves me with lots of questions
Can the NFL fire players for kneeling during the anthem? 9 Legal experts say yes. - Vox
NFL declares 11th commandment: Thou shalt not make the NFL lose money
Chart: How The Public Feels About The NFL Kneeling Protests
The national anthem in sports (spoiler: it wasn't always this way)
Taking a knee: Why are NFL players protesting and when did they start to kneel?, The Independent
U.S. national anthem kneeling protests - Wikipedia
Civil rights groups protest at NFL HQ for players' right to kneel
Biggest NFL Controversies Through the Years: Photos
Question - Can students get in trouble for kneeling during the national anthem? - the McLellan