Resources for the future, Potter, N., & Christy, F. T. (1962). Trends in natural resource commodities; statistics of prices, output, consumption, foreign trade, and employment in the United States, 1870-1957. Published for Resources for the Future by Johns Hopkins Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Resources for the future, Neal Potter, و Francis T. Christy. Trends in Natural Resource Commodities; Statistics of Prices, Output, Consumption, Foreign Trade, and Employment in the United States, 1870-1957. Baltimore: Published for Resources for the Future by Johns Hopkins Press, 1962.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Resources for the future, et al. Trends in Natural Resource Commodities; Statistics of Prices, Output, Consumption, Foreign Trade, and Employment in the United States, 1870-1957. Published for Resources for the Future by Johns Hopkins Press, 1962.