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Dyfyniad Arddull ChicagoDrilhon, Gabriel. Choosing Priorities in Science and Technology. Paris: Organisation for Economic Co-operation and Development, 1991.
Dyfyniad MLADrilhon, Gabriel. Choosing Priorities in Science and Technology. Paris: Organisation for Economic Co-operation and Development, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.