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Dyfyniad Arddull ChicagoFRY, Fred L., Charles R. STONER, and Richard E. HATTWICK. Business: An Integrative Approach.-- Ed.2. Boston: Irwin McGraw-Hill, 2001.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.