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Dyfyniad Arddull ChicagoShim, Jac. The Hand Book of E- Commerce. New Delhi: Infinity Books, 2006.
Dyfyniad MLAShim, Jac. The Hand Book of E- Commerce. Infinity Books, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.