APA Style

Smith, B, F., Enger, E, D. (2004). Environmental science : a study of interrelationships (9th ed.). Boston :: McGraw-Hill Higher Education,.

MLA Style

Smith, Bradley, Fraser.., Enger, Eldon, D.. "Environmental science : a study of interrelationships". 9th ed. Boston :: McGraw-Hill Higher Education,, 2004. Text.