Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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