Cita APA (7th ed.)

Enger, E. D., & Smith , B. F. (2004). Environmental Science : a study of: Interrelationships (9th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Enger, Eldon D., i Bradley F. Smith. Environmental Science : a Study of: Interrelationships. 9th ed. Boston: McGraw-Hill, 2004.

Cita MLA (9th ed.)

Enger, Eldon D., i Bradley F. Smith. Environmental Science : a Study of: Interrelationships. 9th ed. McGraw-Hill, 2004.