Petersen, W. (1979). Malthus. Harvard University Press.
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Dyfyniad Arddull Chicago
Petersen, William. Malthus. Cambridge, Mass.: Harvard University Press, 1979.
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Dyfyniad MLA
Petersen, William. Malthus. Harvard University Press, 1979.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.