Cunningham, W. P., & Cunningham, M. A. (2013). Principles of environmental science: Inquiry & application (Seventh edition.). McGraw-Hill.
芝加哥风格引文Cunningham, William P., 与 Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Application. Seventh edition. New York, NY: McGraw-Hill, 2013.
MLA引文Cunningham, William P., 与 Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Application. Seventh edition. McGraw-Hill, 2013.
警告：这些引文格式不一定是100％准确.