Cunningham, W. P. (2004). Principles of environmental science: Inquiry and Applications. Boston, MA: McGraw-Hill.
استشهاد بنمط شيكاغوCunningham, William P. Principles of Environmental Science: Inquiry and Applications. Boston, MA: McGraw-Hill, 2004.
MLA استشهادCunningham, William P. Principles of Environmental Science: Inquiry and Applications. Boston, MA: McGraw-Hill, 2004.
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