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Dyfyniad Arddull ChicagoWilliams, Ryan. Laptops Just the Steps for Dummies. Hoboken, NJ : Chichester: Wiley ; John Wiley [distributor], 2008.
Dyfyniad MLAWilliams, Ryan. Laptops Just the Steps for Dummies. Wiley ; John Wiley [distributor], 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.