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Dyfyniad Arddull ChicagoHoltz, Herman, and David Zahn. How to Succeed as an Independent Consultant. 4th ed. Hoboken, N.J.: Wiley, 2004.
Dyfyniad MLAHoltz, Herman, and David Zahn. How to Succeed as an Independent Consultant. 4th ed. Wiley, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.