Cunningham, W. P. (2001). Environmental science: A global concern (6th edition.). McGraw-Hill.
芝加哥风格引文Cunningham, William P. Environmental Science: A Global Concern. 6th edition. New York: McGraw-Hill, 2001.
MLA引文Cunningham, William P. Environmental Science: A Global Concern. 6th edition. McGraw-Hill, 2001.
警告：这些引文格式不一定是100％准确.