Sega Genesis Mini Boxes – Minibox Gaming
The History of Football Games - GameSpot
Madden Football History and EA's Other Notable Genesis Football
The History of Football Games - GameSpot
Mavin 6 Sega Genesis Games (Hang-On, NBA Jam, Hockey, Madden 98
John Madden Football (Series) Revoking the Sega Seal of Quality
Sega Genesis Archives - Hackinformer
Madden Football History and EA's Other Notable Genesis Football
Sega Genesis - Madden 98 Football in Box / Case – The Generation X