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Dyfyniad Arddull ChicagoLEAVITT, Jeffrey S. Total Quality Trough Project Management Jeffrey S. Levitt, C [et.al.]. McGraw-Hill, 1994.
Dyfyniad MLALEAVITT, Jeffrey S. Total Quality Trough Project Management Jeffrey S. Levitt, C [et.al.]. McGraw-Hill, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.