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Dyfyniad Arddull ChicagoBry, Gerhard. The Average Workweek as an Economic Indicator. New York: National Bureau of Economic Research, 1959.
Dyfyniad MLABry, Gerhard. The Average Workweek as an Economic Indicator. National Bureau of Economic Research, 1959.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.