Wagner, R. H. (1978). Man and the environment. (3rd ed.). W W Norton.
Lua i Stíl Chicago (17ú heag.)Wagner, Richard H. Man and the Environment. 3rd ed. New York: W W Norton, 1978.
Lua MLA (9ú heag.)Wagner, Richard H. Man and the Environment. 3rd ed. W W Norton, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.