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Dyfyniad Arddull ChicagoBallot, Roberts. Materials Management: A Results Approach. Bombay: Taraporevala, 1980.
Dyfyniad MLABallot, Roberts. Materials Management: A Results Approach. Taraporevala, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.