Pittsburgh Steelers' Super Bowl champion running back Sidney Thornton dies
Who were the most notable Pittsburgh Steelers to wear number 39? - Behind the Steel Curtain
Steelers' 2-time Super Bowl champion is dead at 70
Sidney Thornton: Steelers Mourn Death of Former Running Back - Sports Illustrated
Former Pittsburgh Steelers running back Sidney Thornton passes away at 68 - On3
Super Bowl XIV: Rams can't topple Steelers' dynasty - Los Angeles Times
Former Steelers linebacker Marv Kellum dies at 70
2022 Grambling State Football Fact Book by GramblingStateAthletics - Issuu
Pittsburgh Steelers' Super Bowl champion running back Sidney Thornton dies