Neufeldt, L. (1989). The economist: Henry Thoreau and enterprise. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Neufeldt, Leonard. The Economist: Henry Thoreau and Enterprise. New York: Oxford University Press, 1989.
Lua MLA (9ú heag.)Neufeldt, Leonard. The Economist: Henry Thoreau and Enterprise. Oxford University Press, 1989.
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