Uekötter, F., & Engels, J. I. (2010). The turning points of environmental history. University of Pittsburgh Press.
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Dyfyniad Arddull Chicago
Uekötter, Frank, and Jens Ivo Engels. The Turning Points of Environmental History. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 2010.
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Dyfyniad MLA
Uekötter, Frank, and Jens Ivo Engels. The Turning Points of Environmental History. University of Pittsburgh Press, 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.