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Dyfyniad Arddull ChicagoLEWIS BERNARD T. FACILITY MANAGER`S OPERATION AND MAINTENANCE HANDBOOK. NEW YORK: MCGRAW-HILL, 1999.
Dyfyniad MLALEWIS BERNARD T. FACILITY MANAGER`S OPERATION AND MAINTENANCE HANDBOOK. MCGRAW-HILL, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.