CryptoPunkets #864 - CryptoPunkets
Replay:The History of Video Games, PDF
John Madden--another sports icon gone
EA Sports working on plans to honor John Madden, whose video game came to rule the industry - The Athletic
SNES Articles, RVGFanatic
LIS-10-16-2013 by Shaw Media - Issuu
Why was the Madden video game series named after John Madden? - Quora
Electronic Arts - Wikipedia