Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Enger, Eldon D., y Bradley F. Smith. Enviromental Science: A Study of Interrelationships. 7th ed. Boston,MA: McGraw-Hill, 2000.

Cita MLA (9a ed.)

Enger, Eldon D., y Bradley F. Smith. Enviromental Science: A Study of Interrelationships. 7th ed. McGraw-Hill, 2000.