San Francisco Giants, History & Notable Players
August 11, 1921: Giants win a 'humdinger' over Brooklyn with two late comebacks and 13th-inning rally – Society for American Baseball Research
New York Aces by Mark Rucker - Ebook
SABR Century: 1921 All-NYC World Series – Society for American Baseball Research
SABR Digital Library: The First Negro League Champion: The 1920 Chicago American Giants – Society for American Baseball Research
SABR Century: 1921 Introduction – Society for American Baseball Research
Bill Terry, Giants N.L. from the Baseball trade card series (W517)
1921 World Series Simulation: New York Giants vs. Chicago American Giants – Society for American Baseball Research
Society for American Baseball Research Bibliography Committee Newsletter, Nov. 2011 by ronk232 - Issuu
Connecticut Smoky Joe Wood Chapter, Society For American Baseball Research
Giants–Yankees rivalry - Wikipedia