Ranking the 25 biggest NFL rivalries of all time
A New Era in the Packers Bears Rivalry Starts Sunday
NFL Rivalries: A Look at the Greatest Matchups in Football History
Biggest rival for all 32 NFL teams -- Green Bay Packers, Minnesota Vikings, Washington Redskins, Dallas Cowboys - ESPN
Who Are the Arizona Cardinals' Biggest Rivals? - Sports Illustrated
Who has the biggest NFL rivalry? - AS USA
Sunday Night Football on NBC - The Ravens & Steelers showcase one of the best rivalries in football on SNF.
The 20 Most Bitter Player Rivalries in NFL History, News, Scores, Highlights, Stats, and Rumors
Ranking The NFL's Top 5 Greatest Rivalries
Packers vs. Bears: One of the NFL's Greatest Rivalries