History of the Dallas Cowboys Helmets by Chenglor55 on DeviantArt
Cowboys' Helmet history : r/cowboys
File:Cowboys helmet - 1964.jpg - Wikipedia
Dallas Cowboys Replica Speed 1960 - 1963, Throwback Helmets
Cowboys' Helmet history : r/cowboys
Texas Coach Magazine - November 2020 by Sports In Action - Issuu
2011 Army Football Media Guide by Army West Point Athletics - Issuu