My Life on the Line: How the NFL Damn Near Killed Me and Ended Up Saving My Life: O'Callaghan, Ryan, Zeigler, Cyd: 9781617757587: : Books
How Carl Nassib's Coming Out Made NFL History : NPR
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Homosexuality in American football - Wikipedia
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History-making NFL player Carl Nassib signs with Tampa Bay Buccaneers
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These 39 current NFL players have all played with a gay teammate - Outsports
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Ryan Russell, N.F.L. Free Agent, Comes Out as Bisexual: 'It's So Much Better Than Hiding' - The New York Times