John Madden Signed All Madden Team Official Wilson NFL
John Madden's final flight ticket up for bid at Heritage Auctions
What are the Most Expensive Video Games of All Time?
John Madden Left His Mark On Collecting
The 10 Most Valuable WATA Graded Video Games
ICv2: Heritage Puts Madden's Office Copy of 'John Madden Football
Old school madden auctions : r/MaddenMobileForums
John Madden missed out on much money in video game decision
Was there ever really a Madden Curse and if there was, is it