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Dyfyniad Arddull ChicagoFlaherty, Stephen M. Technical and Business Writing: A Reader-friendly Approach. Englewood Cliffs, New Jersey: Prentice Hall, 1990.
Dyfyniad MLAFlaherty, Stephen M. Technical and Business Writing: A Reader-friendly Approach. Prentice Hall, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.