Cita APA (7th ed.)
Enger, E. D., & Smith, B. F. (1992). Environmental science: A study of interrelationships (4th ed.). W.C. Brown.
Cita Chicago (17th ed.)
Enger, Eldon D., i Bradley F. Smith. Environmental Science: A Study of Interrelationships. 4th ed. Michigan: W.C. Brown, 1992.
Cita MLA (9th ed.)
Enger, Eldon D., i Bradley F. Smith. Environmental Science: A Study of Interrelationships. 4th ed. W.C. Brown, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.