APA (7th ed.) Citation

Enger, E. D., & Smith, B. F. (1998). Environmental science: A study of interrelationships (6th ed.). WCB/McGraw Hill.

Chicago Style (17th ed.) Citation

Enger, Eldon D., and Bradley F. Smith. Environmental Science: A Study of Interrelationships. 6th ed. Boston: WCB/McGraw Hill, 1998.

MLA (8th ed.) Citation

Enger, Eldon D., and Bradley F. Smith. Environmental Science: A Study of Interrelationships. 6th ed. WCB/McGraw Hill, 1998.