Bormann, F. H., & Kellert, S. R. (1991). Ecology, economics, ethics: The broken circle. Yale University Press.
Tohutoru Kātū Chicago (17th ed.)Bormann, F. Herbert, me Stephen R. Kellert. Ecology, Economics, Ethics: The Broken Circle. New Haven: Yale University Press, 1991.
Tohutoro MLA (9th ed.)Bormann, F. Herbert, me Stephen R. Kellert. Ecology, Economics, Ethics: The Broken Circle. Yale University Press, 1991.
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