Greatest Game Ever Pitched Turns 55: Revisiting Sandy Koufax Perfection - Inside the Dodgers
Does anybody think that Sandy Koufax had the best five year peak of any pitcher in the live ball era (since 1920)? - Quora
The Left Arm of God: Sandy Koufax was pitcher perfect on and off the field - Sports Illustrated
Sandy Koufax and the Best Pitchers of the 1960s
The All-Time MLB Team, left-handed starting pitchers: Randy Johnson and Sandy Koufax - AZ Snake Pit
Posnanski: Should average seasons, like Albert Pujols' Anaheim years, help or hurt a Hall of Fame case? - The Athletic
The All-Sandy Koufax Team -- Players who dominated most during their peak years - ESPN
Cybermetrics: Lefty Grove's Peak Vs. Sandy Koufax's Peak
Sandy Koufax's best stats and accomplishments
Who's Greater—Sandy Koufax or Clayton Kershaw? - Tablet Magazine
Following your heart: Sandy Koufax