Adidas v Puma: the bitter rivalry that runs and runs | Athletics | The Guardian
Adidas vs Puma: The Story of the Adidas And Puma Brothers
Sneaker Wars : The Enemy Brothers Who Founded Adidas and Puma and the Family Feud That Forever Changed the Business of Sports by Barbara Smit (2009, Trade Paperback) for sale online | eBay
Two Brothers, Two Sneakers, And A Global Battle For Footwear | Sports History Weekly
Adidas vs Puma: The Story of the Adidas And Puma Brothers
How Puma and Adidas' Rivalry Divided Their Founding Town for 70 Years