NFL national anthem policy: Players on field must show 'respect'
NFL Players Association criticizes new league policy on kneeling during national anthem
NFL players who kneel during the national anthem are not the only ones violating US codes to protect the flag
Benching NFL players for protesting during the anthem would be illegal - Vox
NFL 2018 rule changes: An explainer on new anthem policy, kickoff rules, targeting policy - Pride Of Detroit
NFL, US Soccer giving kneeling during anthem its blessing?
Veteran uses U.S. Flag Code to defend NFL players kneeling during the National Anthem
The Indignity of the N.F.L.'s New National-Anthem Policy
Letter: Kneeling, facing flag, hand on heart is more respectful than many in stands
NFL anthem decision creates controversy