Nike, Adidas, Puma & Saucony advertisements from the Colorado Springs Gazette (March 13, 1981) : Nike Inc., Adidas AG, Puma SE, Saucony, Colorado Springs Gazette Telegraph : Free Download, Borrow, and Streaming : Internet Archive
Sneaker Wars: The Enemy Brothers Who Founded Adidas and Puma and the Family Feud That Forever Changed the Business of Sports : Barbara Smit : Free Download, Borrow, and Streaming : Internet Archive
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