Brubaker, S. (1972). To live on earth: Man and his environment in perspective. Resources for the future by Johns Hopkins Press.
Lua i Stíl Chicago (17ú heag.)Brubaker, Sterling. To Live on Earth: Man and His Environment in Perspective. Baltimore: Resources for the future by Johns Hopkins Press, 1972.
Lua MLA (9ú heag.)Brubaker, Sterling. To Live on Earth: Man and His Environment in Perspective. Resources for the future by Johns Hopkins Press, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.