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Dyfyniad Arddull ChicagoButler, Don. Guide to Ship Repair Estimates in Man-hours. 2nd ed. Amsterdam: Elsevier, 2012.
Dyfyniad MLAButler, Don. Guide to Ship Repair Estimates in Man-hours. 2nd ed. Elsevier, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.