APA-referens (7:e uppl.)

Enger, E. D., & Smith, B. F. (2013). Environmental science: A study of interrelationships (Thirteenth edition.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Enger, Eldon D., och Bradley F. Smith. Environmental Science: A Study of Interrelationships. Thirteenth edition. New York, NY: McGraw-Hill, 2013.

MLA-referens (9:e uppl.)

Enger, Eldon D., och Bradley F. Smith. Environmental Science: A Study of Interrelationships. Thirteenth edition. McGraw-Hill, 2013.