Barger, H., & Schurr, S. H. (1944). The mining industries, 1899-1939: A study of output, employment and productivity. National Bureau of Economic Research.
Citace podle Chicago (17th ed.)Barger, Harold, a Sam H. Schurr. The Mining Industries, 1899-1939: A Study of Output, Employment and Productivity. New York: National Bureau of Economic Research, 1944.
Citace podle MLA (8th ed.)Barger, Harold, a Sam H. Schurr. The Mining Industries, 1899-1939: A Study of Output, Employment and Productivity. National Bureau of Economic Research, 1944.
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