National Football League - Wikiwand
Pro Football Journal: All-Madden Teams
Madden NFL 98 (1997) - MobyGames
List of Madden titles, Madden Wiki
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Madden NFL 2009 (Video Game 2008) - IMDb
Review: Madden NFL 12 – Destructoid
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Madden NFL 09 (2008) - MobyGames