The national anthem in sports (spoiler: it wasn't always this way)
All NFL Players 'Shall Stand And Show Respect' For Flag And Anthem, League Says : The Two-Way : NPR
What Does It Mean When Athletes Kneel During the National Anthem in the Age of Trump?
Taking a knee: Why are NFL players protesting and when did they start to kneel?, The Independent
Fact check: Did Tim Tebow kneeling for God on the field upset the NFL?
What every NFL team did during the national anthem in Week 4 - ESPN - NFL Nation- ESPN
Opinion I Played in the N.F.L. It Needs Way More Than a Black Anthem. - The New York Times
The NFL's decision to play 'Lift Every Voice and Sing' is a false start
What Every N.F.L. Team Did During the National Anthem on Sunday - The New York Times
Nailing the National Anthem: Who's Done It Best? - The New York Times
Do kids really understand meaning of taking a knee for national anthem?, Ed Graney, Sports
U.S. national anthem kneeling protests - Wikipedia