Why N.B.A. Stars Are Trading In Their Nikes - The New York Times
Puma VS Nike VS Adidas - YouTube
Amazon.com: Sneaker Wars: The Enemy Brothers Who Founded Adidas and Puma and the Family Feud That Forever Changed the Business of Sports: 9780061246586: Smit, Barbara: Books
How Puma and Adidas' Rivalry Divided Their Founding Town for 70 Years
Running Shoes That Make You Faster From Nike, Adidas, Puma and Brooks - Bloomberg