Bormann, F. H., & Kellert, S. R. (1991). Ecology, economics, ethics: The broken circle. Yale University Press.
Chicago-čujuhus (17. p.)Bormann, F. Herbert, juo Stephen R. Kellert. Ecology, Economics, Ethics: The Broken Circle. New Haven: Yale University Press, 1991.
MLA-čujuhus (9. p.)Bormann, F. Herbert, juo Stephen R. Kellert. Ecology, Economics, Ethics: The Broken Circle. Yale University Press, 1991.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.