Krutilla, J. V. (1972). Natural environents: Studies in theoretical and applied analysis. Resources for the Future by Johns Hopkins Press University Press.
Chicago-referens (17:e uppl.)Krutilla, John V. Natural Environents: Studies in Theoretical and Applied Analysis. Baltimore: Resources for the Future by Johns Hopkins Press University Press, 1972.
MLA-referens (9:e uppl.)Krutilla, John V. Natural Environents: Studies in Theoretical and Applied Analysis. Resources for the Future by Johns Hopkins Press University Press, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.