APA Style

Enger, E, D., Smith, B, F. (2010). Environmental Science A Study Of Interrelationships (12th ed). New York: Mc Graw Hill.

MLA Style

Enger, Eldon, D.., Smith, Bradley, F.. "Environmental Science A Study Of Interrelationships". 12th ed New York: Mc Graw Hill, 2010. Text.