John Madden's connections with Patriots illustrated how special he was - The Boston Globe
2013-14 NFL Announcer Rankings - Sports Illustrated
Clear the tracks for Big John - Sports Illustrated Vault
Top 10 highest-paid sports announcers
NFL 100: All-time greatest television, radio voices of the league
Super Bowl LIV: Troy Aikman shines, but Patrick Mahomes remark comes back to bite him
NFL history: 100 people who shaped the league, pro football - Sports Illustrated
Al Michaels talks Super Bowl LVI, John Madden, Pat McAfee - Sports Illustrated
Al Michaels' Iconic Voice Made Him a Fortune - FanBuzz
John Madden obituary: NFL analyst dies at 85 - Sports Media Watch