Cita APA (7th ed.)

Enger, E. D., & Smith, B. F. (2013). Environmental science: A study of interrelationships (13th edition.). McGraw Hill.

Cita Chicago (17th ed.)

Enger, Eldon D., i Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 13th edition. New York: McGraw Hill, 2013.

Cita MLA (9th ed.)

Enger, Eldon D., i Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 13th edition. McGraw Hill, 2013.