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Dyfyniad Arddull ChicagoCommititee on the International Construction industry. Building for Tomorrow: Global Enterprise and the U. S. Construction Industry. Washington, D. C: National Academy Press, 1998.
Dyfyniad MLACommititee on the International Construction industry. Building for Tomorrow: Global Enterprise and the U. S. Construction Industry. Washington, D. C: National Academy Press, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.