Graphis photo 90.

MLA

Herdeg, W, and B.M Pedersen. Graphis Photo 90. Zürich: Graphis Press corp., 1990.

APA

Herdeg, W., & Pedersen, B. (1990). Graphis photo 90. Zürich: Graphis Press corp.

Chicago

Herdeg, W., and B.M Pedersen. Graphis Photo 90. Zürich: Graphis Press corp., 1990.