Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
What to expect from NFL officiating in 2020 - coronavirus protocols, electronic whistles and inexperience - ESPN
NFL Week 5: Referee Land Clark assigned to Chiefs vs. Vikings game - A to Z Sports
U.S. Armed Forces veterans saluted as referees on Veterans Day, Ron Kantowski, Sports
Officiating crews for the 2021 season – Football Zebras
Carl Cheffers, Super Bowl referee, has history of penalties vs. Chiefs - The Washington Post
NFL officiating is under fire, putting the Super Bowl crew in the spotlight - The Athletic
Week 11 referee assignments – Football Zebras
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make