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Dyfyniad Arddull ChicagoO'Gordon, Gerald. Modern Trends in Mental Health and Subnormality. London: Butterworths, 1968.
Dyfyniad MLAO'Gordon, Gerald. Modern Trends in Mental Health and Subnormality. Butterworths, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.