The NFL, National Anthem etiquette, and flag code: What you need to know
New NFL Ruling On National Anthem Stirs Up Controversy Yet Again : Code Switch : NPR
Please Rise for Our National Anthem — if You're Not Too Busy - The New York Times
Hey NFL? Why Are You Messing With My Flag?, by Jason Maynard
What must Americans do during the anthem? - BBC News
Are you disrespecting the flag? Here's what the rules say.
NFL National Anthem Rules Disrespect Flag
Rep. Marsha Blackburn files resolution on national anthem etiquette amid protests
The NFL's 'Anthem Policy' Is Pure Hypocrisy
14 ways you are disrespecting the American flag and might not know it
What Is the U.S. Flag Code?