Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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