APA (7th ed.) Zitazioa
Enger, E. D., & Smith, B. F. (2004). Environmental science: A study of interrelationships (9th ed.). McGraw-Hill Higher Education.
Chicago Style (17th ed.) Zitazioa
Enger, Eldon D., eta Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 9th ed. Boston: McGraw-Hill Higher Education, 2004.
MLA (9th ed.) Zitazioa
Enger, Eldon D., eta Bradley Fraser Smith. Environmental Science: A Study of Interrelationships. 9th ed. McGraw-Hill Higher Education, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.