Freedman, B. (2001). Environmental science: A Canadian perspective. Prentice Hall.
芝加哥风格引文Freedman, Bill. Environmental Science: A Canadian Perspective. Toronto: Prentice Hall, 2001.
MLA引文Freedman, Bill. Environmental Science: A Canadian Perspective. Prentice Hall, 2001.
警告：这些引文格式不一定是100％准确.