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Dyfyniad Arddull ChicagoSemler, E G Ed. by. Management for Engineers. London: IME, 1972.
Dyfyniad MLASemler, E G Ed. by. Management for Engineers. IME, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.