Cunningham, W. P., & Cunningham, M. A. (2006). Principles of environmental science: Inquiry and applications (3rd ed.). McGraw-Hill.
芝加哥风格引文Cunningham, William P., 与 Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 3rd ed. Dubuque, IA: McGraw-Hill, 2006.
MLA引文Cunningham, William P., 与 Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 3rd ed. McGraw-Hill, 2006.
警告：这些引文格式不一定是100％准确.