Cita APA

Enger, E. D., & Smith, B. F. (1992). Environmental science: A study of interrelationships (4th ed.). W.C. Brown.

Citación estilo Chicago

Enger, Eldon D., and Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 4th ed. Dubuque, IA: W.C. Brown, 1992.

Cita MLA

Enger, Eldon D., and Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 4th ed. W.C. Brown, 1992.