1969–1980 – SABR's Baseball Cards Research Committee
Palmer's 20th win makes history for Orioles
The Fantastic Four - BallNine
Baltimore Orioles Price List - Supercollector Catalog
Wrong White
Four 20-game winners in 1971 – Bowie News
Retro Orioles recap: Jim Palmer hurls 10-inning complete game in 4
Four 20-Game Winners with the 1920 Chicago White Sox and 1971
Palmer's 20th win makes history for Orioles
One more time for The Infield