National Bureau of Economic Research. (1960). Trends in the American Economy in the 19th century Vol.24: Studies in income and wealth (24.).
Dyfyniad Arddull ChicagoNational Bureau of Economic Research. Trends in the American Economy in the 19th Century Vol.24: Studies in Income and Wealth. 24. Princeton University Press, Princeton, 1960.
Dyfyniad MLANational Bureau of Economic Research. Trends in the American Economy in the 19th Century Vol.24: Studies in Income and Wealth. 24. 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.