Potter, N., & Christy, F. T. (1962). Trends in natural resoure commodities: Statistics of prices, output, consumption, foreign trade and employment in the United States 1870-1957. Baltimore: John Hopkins Press.
Παραπομπή Chicago StylePotter, Neal, and Francis T. Christy. Trends in Natural Resoure Commodities: Statistics of Prices, Output, Consumption, Foreign Trade and Employment in the United States 1870-1957. Baltimore: John Hopkins Press, 1962.
Παραπομπή MLAPotter, Neal, and Francis T. Christy. Trends in Natural Resoure Commodities: Statistics of Prices, Output, Consumption, Foreign Trade and Employment in the United States 1870-1957. Baltimore: John Hopkins Press, 1962.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.