The Evolution of the Quarterback: The 60's
Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture
Jason Reid's 'Rise of the Black Quarterback' Shines a Spotlight on the History Between Race and the NFL's Most Important Position
Dual-threat quarterback - Wikipedia
List of Indianapolis Colts starting quarterbacks - Wikipedia
The Evolution of the Quarterback: The 70's
Where do NFL quarterbacks come from? The best and worst states, how it's changed
The History of Football Games - GameSpot
What is the longest rushing touchdown by an NFL quarterback? - Quora
My Top 15 NFL Quarterbacks of the 1970s
Top 5 Miami Dolphins Quarterbacks of All Time - Sports Illustrated