This Day in Yankees History: the first use of the knuckleball mitt
KNUCKSIE HASN'T LOST HIS GRIP - Sports Illustrated Vault
Niekro one of Hall of Fame's great ambassadors
New York Yankees - Wikipedia
The Baseball 100: No. 83, Phil Niekro - The Athletic
Notable Yankees Offseason Moves - Sports Illustrated
Phil Niekro Signs 2-Year Yankee Pact - The New York Times
Phil Niekro, Hall of Fame knuckleballer and former Braves pitcher
With Phil Niekro's Death, Baseball Has Lost the Knuckleball and
Will Manny Machado, Bryce Harper join long list of Yankees' shiny
Baseball Hall of Famer, knuckleballer Phil Niekro dies at 81
Ex-Yankee, Hall of Famer Phil Niekro dies
Phil Niekro dies at 81
Move to Yankees showed Niekro had plenty of pitches remaining
On not forgetting Phil Niekro - Battery Power