Cita APA (7th ed.)

Enger, E. D., & Smith, B. F. (2000). Environmental science: A study of interrelationships (7th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Enger, Eldon D., i Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 7th ed. Boston: McGraw-Hill, 2000.

Cita MLA (9th ed.)

Enger, Eldon D., i Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 7th ed. McGraw-Hill, 2000.