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Dyfyniad Arddull ChicagoSkidmore, Steve. Introducing Systems Design. 2th .ed. Manchester: NCC Blackwell, 1990.
Dyfyniad MLASkidmore, Steve. Introducing Systems Design. 2th .ed. NCC Blackwell, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.