Baseball great Phil Niekro dies of cancer at 81
Phil Niekro, knuckleball specialist, dies at 81 - Sports Illustrated
Phil Niekro's legacy with Braves filled with innings, wins, relationships - The Athletic
Orioles' pitchers go to school of hard knuckles - The Globe and Mail
Joe Niekro, 61, a Master of the Knuckleball, Is Dead - The New York Times
Saying goodbye to the knuckleball, and its master
Phil Niekro, Hall of Fame Knuckleball Pitcher, Dies at 81 - The New York Times
Phil Niekro, RIP: Great pitcher, better friend
Phil Niekro, Baseball Wiki
Phil Niekro The History of the Atlanta Braves
Baseball Hall of Famer, knuckleballer Phil Niekro dies at 81