NFL Top 50: Jim Brown is best player in league history, edges Giants' Lawrence Taylor in Daily News' rankings (Nos. 1-10) – New York Daily News
The 150 greatest players in college football's 150-year history - ESPN
1973 Chargers at Browns Game 7
A History of the San Diego Chargers, Part 10: The Nightmare Season - Bolts From The Blue
Quarterback Johnny Unitas of the San Diego Charger looks on during News Photo - Getty Images
Which famous NFL players didn't play football in college before getting drafted? - Quora
Pro Football Journal: Johnny Unitas Week: 1973 San Diego Chargers
John Mackey (American football) - Wikipedia