Football Zebras - Analysis and commentary of the NFL's officials and the calls they make
NFL Replay Rules Remain Problem For Officials
Week 3 referee assignments – Football Zebras
NFL replay VP takes administrative leave in awkward officiating transition – Football Zebras
Analysis and commentary of the NFL's officials and the calls they make - Football Zebras
How the Dez Bryant no-catch changed the NFL forever - ESPN
Replay review in gridiron football - Wikipedia
NFL to consider radical replay question: Should coaches be allowed to challenge every single play?
Football Zebras - Analysis and commentary of the NFL's officials and the calls they make