Gaya APA

D., E, E. (2010). Environmental Science: a study of interrelationships (thirteenth edition). New York: The MCGraw-Hill Companies, Inc.CRC Press.

Gaya MLA

D., Enger., Eldon. "Environmental Science: a study of interrelationships". thirteenth edition New York: The MCGraw-Hill Companies, Inc.CRC Press, 2010. ML.