APA (7e ed.) Bronvermelding

Enger, E. D., & Smith, B. F. (2004). Environmental science: A study of interrelationships (Ninth edition.). McGraw-Hill Higher Education.

Chicago (17e ed.) Bronvermelding

Enger, Eldon D., en Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. Ninth edition. Boston: McGraw-Hill Higher Education, 2004.

MLA (8e ed.) Bronvermelding

Enger, Eldon D., en Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. Ninth edition. McGraw-Hill Higher Education, 2004.