APA (7th ed.) Citation

Johnson, C. (1986). The practical zone system: A simple guide to photographic control. Focal Press.

Chicago Style (17th ed.) Citation

Johnson, Chris. The Practical Zone System: A Simple Guide to Photographic Control. Boston: Focal Press, 1986.

MLA (9th ed.) Citation

Johnson, Chris. The Practical Zone System: A Simple Guide to Photographic Control. Focal Press, 1986.

Warning: These citations may not always be 100% accurate.