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Dyfyniad Arddull ChicagoEugenics Society, London, Peter R. Cox, and John Peel. Population and Pollution: Proceedings of the Eighth Annual Symposium of the Eugenics Society. London: Academic Press, 1972.
Dyfyniad MLAEugenics Society, London, et al. Population and Pollution: Proceedings of the Eighth Annual Symposium of the Eugenics Society. Academic Press, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.