APA (7th ed.) Citation

Johnson, C. (1994). The practical zone system: A simple guide to photographic control (Rev. ed.). Focal Press.

Chicago Style (17th ed.) Citation

Johnson, Chris. The Practical Zone System: A Simple Guide to Photographic Control. Rev. ed. Boston: Focal Press, 1994.

MLA (9th ed.) Citation

Johnson, Chris. The Practical Zone System: A Simple Guide to Photographic Control. Rev. ed. Focal Press, 1994.