Caldwell, L. K. (1970). Environment: A challenge for modern society. Pub. for the American Museum of Natural History [by] the Natural History Press.
Lua i Stíl Chicago (17ú heag.)Caldwell, Lynton Keith. Environment: A Challenge for Modern Society. Garden City, N.Y: Pub. for the American Museum of Natural History [by] the Natural History Press, 1970.
Lua MLA (9ú heag.)Caldwell, Lynton Keith. Environment: A Challenge for Modern Society. Pub. for the American Museum of Natural History [by] the Natural History Press, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.