APA-referens

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

Chicago-stil citat

Enger, Eldon D., och Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. Boston: McGraw Hill higher education, 2006.

MLA-referens

Enger, Eldon D., och Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. McGraw Hill higher education, 2006.