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Dyfyniad Arddull Chicagoebrary, Inc, Katherine Tyler, Mark Patton, Marco Mongiello, and Derek Meyer. Business to Business Services: Multiple Markets and Multi-disciplinary Perspectives for the Twenty-first Century. Bradford, England: Emerald Group Publishing, 2007.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.