Cunningham, W. P., & Cunningham, M. A. (2020). Principles of environmental science: Inquiry & applications (Ninth editon.). McGraw-Hill Education.
芝加哥风格引文Cunningham, William P., 与 Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. Ninth editon. New York, NY: McGraw-Hill Education, 2020.
MLA引文Cunningham, William P., 与 Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. Ninth editon. McGraw-Hill Education, 2020.
警告：这些引文格式不一定是100％准确.