The 150 greatest players in college football's 150-year history - ESPN
How Deion Sanders played baseball and football on the same day: Revisiting his historic 1992 NFL, MLB attempt
List of top athletes to play 2 or more sports
TSN was ratioed after including Tim Tebow in a multi-sport athlete poll
List of top athletes to play 2 or more sports
Michael Jordan, Most Famous 2-Sport Careers After Tim Tebow Retires from Mets, News, Scores, Highlights, Stats, and Rumors
List of top athletes to play 2 or more sports
TSN was ratioed after including Tim Tebow in a multi-sport athlete poll
Both NFL and MLB Athletes - Sports Illustrated
The 150 greatest players in college football's 150-year history - ESPN
Is it possible to play on two professional sports teams in the U.S.? - Quora