List of Madden titles, Madden Wiki
Madden NFL 12 (2011) - MobyGames
Madden NFL 2005 - Wikipedia
EA Sports™ Madden NFL 07 (2006)
Madden NFL 12 (2011) - MobyGames
Madden NFL '96 - Wikipedia
Madden NFL 11: Power Ranking the Last Decade of Madden Games, News, Scores, Highlights, Stats, and Rumors
Madden NFL 12 (2011) - MobyGames
Madden NFL 12 (Video Game 2011) - IMDb
EA Sports™ Madden NFL 08 (2007)