APA (7th ed.) Citation

Johnson, C. (2012). The practical zone system: For film and digital photography : classic tool, universal applications (5th ed.). Focal Press.

Chicago Style (17th ed.) Citation

Johnson, Chris. The Practical Zone System: For Film and Digital Photography : Classic Tool, Universal Applications. 5th ed. Waltham, Mass: Focal Press, 2012.

MLA (9th ed.) Citation

Johnson, Chris. The Practical Zone System: For Film and Digital Photography : Classic Tool, Universal Applications. 5th ed. Focal Press, 2012.