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Dyfyniad Arddull ChicagoThompson, Warren Simpson. Population Problems. Bombay: Tata McGraw-Hill Publishing Company Ltd, 1965.
Dyfyniad MLAThompson, Warren Simpson. Population Problems. Tata McGraw-Hill Publishing Company Ltd, 1965.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.