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Dyfyniad Arddull ChicagoSmith, Ronald C. Principles and Practices of Light Construction. 4th Ed. Englewood: Cliffs, 1986.
Dyfyniad MLASmith, Ronald C. Principles and Practices of Light Construction. 4th Ed. Cliffs, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.