Brother of first Black NL umpire Williams speaks at CSUB, News
What made MLB's 1971 All-Star Game in Detroit one of the best ever
Alec Bohm of Phillies Connects for 1,000th World Series Homer - The New York Times
Forgotten milestone: MLB's first Black umpire took the field for Cleveland Indians game
Major League Baseball used to have some ridiculous rules – The Denver Post
MLB appoints 1st black umpire crew chief – Sun Sentinel
Called Out But Safe - By Al Clark & Dan Schlossberg : Target
Umpire (baseball) - Wikipedia
Inspirational Story of National League's First Black Umpire Highlighted in New Book and Mini Documentary - PW Perspective
Study Finds that Old Men with Experience are Actually the Worst MLB Umpires - FanBuzz