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
Adidas vs. Puma: A History of Two Brothers – Explosion
Adidas vs. Puma - YouTube
Duell der Brüder - Die Geschichte von Adidas und Puma (TV Movie 2016) - IMDb