Graphis photo 91 : the international annual of photography.

MLA

Herdeg, W, and B.M Pedersen. Graphis Photo 91 : the International Annual of Photography. Zûrich: Graphis Press, 1991.

APA

Herdeg, W., & Pedersen, B. (1991). Graphis photo 91 : the international annual of photography. Zûrich: Graphis Press.

Chicago

Herdeg, W., and B.M Pedersen. Graphis Photo 91 : the International Annual of Photography. Zûrich: Graphis Press, 1991.