APA (7th ed.) Citation

Stepan, P., & Biegert, C. (2000). Photos that changed the world: The 20th century. Prestel.

Chicago Style (17th ed.) Citation

Stepan, Peter, and Claus Biegert. Photos That Changed the World: The 20th Century. Munich : London: Prestel, 2000.

MLA (9th ed.) Citation

Stepan, Peter, and Claus Biegert. Photos That Changed the World: The 20th Century. Prestel, 2000.