Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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