Upon further review, NFL officiating is in 'decline'
Stung by Discord Over Officiating, the N.F.L. Puts a Coach in Charge - The New York Times
Official (gridiron football) - Wikipedia
NFL Football Operations NFL Football Operations
The Rules of the Draft NFL Football Operations
History of Instant Replay
NFL Football Operations NFL Football Operations
NFL first: About one-fifth of the 124 officials will be made full-time employees this season - Los Angeles Times
Officials' Responsibilities & Positions
NFL refs roster includes 1st female instant replay official
NFL May Soon Split Instant Replay Decisions Between NYC and LA
Replay Assistance Rule NFL Football Operations