Carl Nassib Makes History by Becoming First Gay Man to Play in NFL Game
10 NFL Stars Who've Come Out as Gay or Bisexual
Ryan O'Callaghan: Former Patriots, Chiefs player comes out as gay - Sports Illustrated
Homosexuality in American football - Wikipedia
Carl Nassib: NFL supports first openly gay active player. Will more athletes come out?
Why Is Michael Sam Still An NFL Free Agent?
Former MU football player comes out as gay, may be NFL's first openly gay player
Michael Sam reflects on career, LGBTQ progress in sports, Mizzou Football
NFL teams adapt to unrelenting heat at camp
Michael Sam is free agent after NFL teams pass during waivers period, NFL
The N.F.L.'s Carl Nassib Broke a Barrier. Will Others Follow? - The New York Times