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Dyfyniad Arddull ChicagoBlake, Gary. Quick Tips for Better Business Writing. New York: McGraw-Hill, Inc, 1995.
Dyfyniad MLABlake, Gary. Quick Tips for Better Business Writing. McGraw-Hill, Inc, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.