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Dyfyniad Arddull ChicagoMoore, Ruth. Man in the Environment. Tata McGraw-Hill, 1975.
Dyfyniad MLAMoore, Ruth. Man in the Environment. Tata McGraw-Hill, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.