Cita APA (7th ed.)
Enger, E. D., & Smith, B. F. (2010). Environmental science: A study of interrelationships (12th ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Enger, Eldon D., i Bradley F. Smith. Environmental Science: A Study of Interrelationships. 12th ed. Boston: McGraw-Hill, 2010.
Cita MLA (9th ed.)
Enger, Eldon D., i Bradley F. Smith. Environmental Science: A Study of Interrelationships. 12th ed. McGraw-Hill, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.