In baseball, the knuckleball is quickly disappearing - The Washington Post

Knuckleball! (2012) - IMDb

Why are there no knuckleballers in professional baseball anymore? Is it a physiological issue, the difficulty catching a knuckleballer, or something else? - Quora

Shove' the one you're with: Max Scherzer was simply dealing for the Nationals - The Washington Post

A Fluttering Boost to Flickering Hopes - The New York Times

Knuckleball - Wikipedia

Mets' Pitcher Makes 'Knuckleball!' His Own : NPR

Why the knuckleball takes such a knucklehead path

Charlie Hough used his knuckleball to fuel 25-year career

R.A. Dickey On 'Winding Up' As A Knuckleballer

Toad Ramsey invented the knuckleball

Knuckleball Grip, Part 3: Depth of the Baseball – Knuckleball Nation

Enjoy Dickey, knuckleball while you can

The Knuckleball Can Devastate, So Why Don't All Pitchers Throw It? : The Two-Way : NPR

Why are there no knuckleballers in professional baseball anymore? Is it a physiological issue, the difficulty catching a knuckleballer, or something else? - Quora

Knuckleheads: The 1945 Senators and the First All-Knuckleball Rotation