It might be time for an MLB knuckleball pitch comeback - Los Angeles Times
The knuckleball is dying out of baseball
espnW -- 'Knuckleball!' baseball documentary about life more than sport - ESPN
Unpredictable and unmanly: baseball's fear of the knuckleball, Baseball
Knuckleball: The History of the Unhittable Pitch: 9781613217665: Freedman, Lew: Books
Notable Knuckleballers - Sports Illustrated
Why the knuckleball takes such a knucklehead path
Japanese pitcher Eri Yoshida brings knuckleball to upstate New York
Knuckleball! (2012) - IMDb
The Top 5: Knuckleball Quotes - SB Nation New York