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Dyfyniad Arddull ChicagoShurter, R. Business Research & Report Writing. New York: Mc Graw Hill, 1964.
Dyfyniad MLAShurter, R. Business Research & Report Writing. Mc Graw Hill, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.