Frizot, Michael. New History of Photography. Place of publication not identified: Pajerski, 1999. Print P. 328
Kruse, Margret. Kunstphotographie Um 1900: D. Sammlung Ernst Juhl; Hamburg: Museum für Kunst u. Gewerbe, 1989 pl. 672
Peterson, Christian A. Camera Work: Process & Image : [exhibition, Minneapolis, Minneapolis Institute of Arts, August 31-November 3, 1985, Seattle, Seattle Art Museum, November 22, 1985-February 2, 1986]. Minneapolis: Minneapolis Institute of arts, 1985. p. 49.