There have been 11 known gay players in NFL history - Outsports
Gay NFL Players: The 14 Men Who Came Out After Their Careers
26 Football Players Who Came Out of the Closet
Ray McDonald: What happened to Washington's first pick in 1967 NFL draft? - Sports Illustrated
Dave Kopay made LGBTQ sports history by coming out in 1976 - Outsports
The NFL Beat': Lombardi and Kopay: A gay player's memories of a legendary coach - Sports - The Austin Chronicle
Dave Kopay: The NFL's Closet Case
Jaguars' Kevin Maxen comes out as gay in 1st for US pros
Dave Kopay shocked the sports world in 1975 - Out In Jersey
Sports Complex - Windy City Times
Jaguars' Kevin Maxen comes out as gay in 1st for US pros