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Dyfyniad Arddull ChicagoRuggles, Nancy D., and Richard Ruggles. The Design of Economic Accounts. New York: National Bureau of Economic Research, 1970.
Dyfyniad MLARuggles, Nancy D., and Richard Ruggles. The Design of Economic Accounts. National Bureau of Economic Research, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.