Notable Knuckleballers - Sports Illustrated

Jim Bouton, Author of Tell-All Baseball Memoir 'Ball Four,' Dies at 80 - The New York Times

A look at some of baseball's most notable knuckleballers - The Boston Globe

Oddball The New Yorker

Best knuckleball pitchers in baseball history

Phil Niekro had an INSANE knuckleball!

Famous knuckleballers

Knuckleball Pitchers: Faster is Not Always Better

Phil Niekro, Hall of Fame knuckleballer, dead at 81

List of knuckleball pitchers - Wikipedia

Baseball Hall of Famer, knuckleballer Phil Niekro dies at 81

As far as knuckleball pitchers are concerned, do they get to throw what they want, or are there signs for them as well? - Quora