Johnson, C. (1986). The practical zone system: A simple guide to photographic control. Focal Press.
芝加哥风格引文Johnson, Chris. The Practical Zone System: A Simple Guide to Photographic Control. Boston: Focal Press, 1986.
MLA引文Johnson, Chris. The Practical Zone System: A Simple Guide to Photographic Control. Focal Press, 1986.
警告：这些引文格式不一定是100％准确.