APA (7e ed.) Bronvermelding

Enger, E. D., & Smith, B. F. (2006). Environmental science: A study of interrelationships (10th ed.). McGraw-Hill College.

Chicago (17e ed.) Bronvermelding

Enger, Eldon D., en Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. New York: McGraw-Hill College, 2006.

MLA (9e ed.) Bronvermelding

Enger, Eldon D., en Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. McGraw-Hill College, 2006.