Stepan, P., & Billeter, E. (1999). Icons of photography: The 20th century / ed. by Peter Stephan. With contributions by: Erika Billeter. Prestel.
Lua i Stíl Chicago (17ú heag.)Stepan, Peter, agus Erika Billeter. Icons of Photography: The 20th Century / Ed. by Peter Stephan. With Contributions by: Erika Billeter. Munich ; London ; New York: Prestel, 1999.
Lua MLA (8ú heag.)Stepan, Peter, agus Erika Billeter. Icons of Photography: The 20th Century / Ed. by Peter Stephan. With Contributions by: Erika Billeter. Prestel, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.