ebrary, Inc, & Sack, R. D. (2002). Progress: Geographical essays. Johns Hopkins University Press.
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Dyfyniad Arddull Chicago
ebrary, Inc, and Robert David Sack. Progress: Geographical Essays. Baltimore: Johns Hopkins University Press, 2002.
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Dyfyniad MLA
ebrary, Inc, and Robert David Sack. Progress: Geographical Essays. Johns Hopkins University Press, 2002.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.