APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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