Cita APA (7a ed.)

Johnson, C. (2012). The practical zone system: For film and digital photography (5th ed.). Elsevier/Focal Press.

Cita Chicago Style (17a ed.)

Johnson, Chris. The Practical Zone System: For Film and Digital Photography. 5th ed. Amsterdam ; Boston: Elsevier/Focal Press, 2012.

Cita MLA (9a ed.)

Johnson, Chris. The Practical Zone System: For Film and Digital Photography. 5th ed. Elsevier/Focal Press, 2012.