Babe Ruth – Society for American Baseball Research
Babe Ruth Baseball Signed
1947 Ruth Gem Mint 10 Autographed Baseball, Thousands of Cardboard Icons Lead Off Memory Lane Auction
1924 Babe Ruth First Home Run of Season Game Used & Signed Bat, PSA/DNA GU 10
1919 contract selling Babe Ruth to the Yankees being auctioned - The Boston Globe
1995–2010 – SABR's Baseball Cards Research Committee
Signed Babe Ruth 702nd Home Run Ball Brings $264,500
R. PLAPINGER BASEBALL BOOKS - SportsAntiques.com
Calaméo - REA_2014 Fall
Magnificent Babe Ruth & Lou Gehrig Dual Signed 1927 National League Baseball JSA
Scientists explored secrets behind Ruth's epic 1921 season