Enger, E. D., & Smith, B. F. (2006). Environmental science: A study of interrelationships (10th ed.). McGraw-Hill College.
Lua i Stíl Chicago (17ú heag.)Enger, Eldon D., agus Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. New York: McGraw-Hill College, 2006.
Lua MLA (9ú heag.)Enger, Eldon D., agus Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. McGraw-Hill College, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.