Enger, E. D., & Smith, B. F. (2013). Environmental science: A study of interrelationships (Thirteenth edition.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Enger, Eldon D., agus Bradley F. Smith. Environmental Science: A Study of Interrelationships. Thirteenth edition. New York, NY: McGraw-Hill, 2013.
Lua MLA (9ú heag.)Enger, Eldon D., agus Bradley F. Smith. Environmental Science: A Study of Interrelationships. Thirteenth edition. McGraw-Hill, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.