Davies, D. G. (1967). Fresh water: The precious resource. Natural Press for the American Museum of Natural History.
Lua i Stíl Chicago (17ú heag.)Davies, Delwyn G. Fresh Water: The Precious Resource. GArden City, N. Y: Natural Press for the American Museum of Natural History, 1967.
Lua MLA (9ú heag.)Davies, Delwyn G. Fresh Water: The Precious Resource. Natural Press for the American Museum of Natural History, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.