David Cone throws a perfect game for the New York Yankees in 1999

Yankees pitcher Domingo Germán throws perfect game against Oakland - Los Angeles Times

July 18, 1999: With Don Larsen watching, David Cone channels perfection for Yankees – Society for American Baseball Research

Yankees pitcher Domingo Germán throws perfect game against Oakland, the 24th in MLB history

David Cone's perfect game - Wikipedia

Oral history of David Cone's perfect game

One-on-one with David Cone on perfect game, playing for Joe Torre, etc.

David Cone Perfect Game: 7/18/1999 (All 27 Outs)

Weeks after throwing perfect game, Yankee pitcher Domingo Germán enters treatment for alcohol abuse

David Cone throws a perfect game for the New York Yankees in 1999

David Wells' perfect game - Wikipedia