Citazione Stile APA (7a Edizione)

Enger, E. D., & Smith, B. F. (2004). Environmental science: A study of interrelationships (Ninth edition.). McGraw-Hill Higher Education.

Citazione stile Chigago Style (17a edizione)

Enger, Eldon D., e Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. Ninth edition. Boston: McGraw-Hill Higher Education, 2004.

Citatione MLA (8a ed.)

Enger, Eldon D., e Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. Ninth edition. McGraw-Hill Higher Education, 2004.