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Dyfyniad Arddull ChicagoSutermeister, Robert A. People and Productivity. New York: McGraw-Hill, 1963.
Dyfyniad MLASutermeister, Robert A. People and Productivity. McGraw-Hill, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.