Adidas v Puma: the bitter rivalry that runs and runs | Athletics | The Guardian
Two Brothers, Two Sneakers, And A Global Battle For Footwear | Sports History Weekly
Adidas vs. Puma - Top 10 Family Feuds - TIME
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
adidas Predator Accuracy.1 IN - Own Your Football Pack - SoccerPro