Wrigley Field history: A new, colorized photo of a Babe Ruth World Series home run - Bleed Cubbie Blue
How would Babe Ruth and Ty Cobb have fared against each other if they played against each other? - Quora
Yankee Stadium's first winner: Sigel's Bob Shawkey, Local
Polo Grounds Seat Restoration Links Back to History of Fabled Ballpark - Sports Collectors Digest
Robert Edward Auctions - The Premiere Sports Auction House
July 19, 1920: Babe Ruth breaks his own record with 30th home run – Society for American Baseball Research
1920: Babe Ruth Highlights in Color
Yankee Stadium's first winner: Sigel's Bob Shawkey, Local
David Cycleback – SABR's Baseball Cards Research Committee
WATCH an incredible video of Yankees' Babe Ruth and Lou Gehrig hit batting practice in color
Did Ty Cobb ever say that he would have been a better player than Babe Ruth? - Quora
Can Babe Ruth Hit a Dead Center Home-Run at Polo Grounds?
Babe Ruth's called shot - Wikipedia