NFL referee assignments Week 9: Who are the officials for every game this week?
NFL rule changes: Modified instant replay, more positions allowed to wear single-digit jerseys - The Washington Post
NFL creates new officiating post: VP of replay and administration – Football Zebras
NFL's roughing the passer calls beg for further replay review
NFL Football Operations NFL Football Operations
Replay Assistance Rule NFL Football Operations
NFL Football Operations NFL Football Operations
Official (gridiron football) - Wikipedia
NFL distributes updated rules on pass interference replay review
NFL Rule Changes: Expanded replay on pass interference key topic - Sports Illustrated
Super Bowl 2020 referee, officials: Who is assigned to 49ers vs. Chiefs?