1998 Yankees Diary, April 18: David Cone returns to standard form - Pinstripe Alley
1998 Yankees Diary, June 14: David Cone returns to rotation, spins gem - Pinstripe Alley
David Cone – Society for American Baseball Research
Remembering David Cone's perfect game for NY Yankees, 20 years later
Oral history of David Cone's perfect game
David Cone had a hilarious response to audio issues on YES Network
David Cone throws a perfect game against Montreal on Yogi Berra Day
1998 Yankees, June 30: Coney complete game and big innings do the trick - Pinstripe Alley
1998 Yankees Diary, April 4: David Cone can't stop the bleeding - Pinstripe Alley
David Wells threw his perfect game 21 years ago today, Bronx Pinstripes