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Dyfyniad Arddull ChicagoOwen, D.F. Man's Environmental Predicament: An Introduction to Human Ecology in Tropical Africa. London: Oxford University, 1973.
Dyfyniad MLAOwen, D.F. Man's Environmental Predicament: An Introduction to Human Ecology in Tropical Africa. Oxford University, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.