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Dyfyniad Arddull ChicagoMcGraw-Hill Encyclopaedia of Science and Technology. New York: McGraw-Hill, 1977.
Dyfyniad MLAMcGraw-Hill Encyclopaedia of Science and Technology. McGraw-Hill, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.