Wrigley100 -- Chicago Tribune
A thorough account of pitchers who have started both games of a doubleheader in the major leagues
Hippo Vaughn, Chicago Cubs, 1914 (photo colorized by Mancave Pictures)
The 1918 Baseball Season: Ruth Emerges, While War and Gambling Take Its Toll!
Back to the Dead Ball Era We Go! 1918 Cubs!
From the archives - The history of the national anthem in sports - ESPN
September 7, 1918: Boston's Carl Mays outduels Cubs' Hippo Vaughn in Game 3 – Society for American Baseball Research
Pale Hose History
Back Into the Dead Ball Era We Go! The 1918 Season and the Pennant-Winning Cubs!