Duell der Brüder - Die Geschichte von Adidas und Puma (TV Movie 2016) - IMDb
Sneaker Wars: The Enemy Brothers Who Founded Adidas and Puma and the Family Feud That Forever Changed the Business of Sports: Smit, Barbara: 9780061246586: Amazon.com: Books
Rivals Forever - The Sneaker Battle (TV Mini Series 2016– ) - IMDb