Year of the Pitcher book: Bob Gibson 1967 World Series - Sports Illustrated
Sept. 27, 1968 Bob Gibson sets a record that hasn't been touched since
The MLB Relief Pitcher Championship Belt - The Ringer
Commish's Classic: How they changed the rules for Bob Gibson
Sept. 27, 1968 Bob Gibson sets a record that hasn't been touched since
The day Bob Gibson whiffed 17 Tigers on the way to World Series history
October 10, 1968: Lolich outduels Gibson in dramatic Game Seven victory – Society for American Baseball Research
Bob Gibson: Breaking News, Rumors & Highlights
The day Bob Gibson whiffed 17 Tigers on the way to World Series history
1969 Topps World Series Game 1 (Bob Gibson Fans 17; Sets New Record)