Barger, H., & Schurr, S. H. (1972). The mining industries, 1899-1939: A study of output, employment and productivity. Arno Press.
Chicago-viite (17. p.)Barger, Harold, ja Sam H. Schurr. The Mining Industries, 1899-1939: A Study of Output, Employment and Productivity. New York: Arno Press, 1972.
MLA-viite (8. p.)Barger, Harold, ja Sam H. Schurr. The Mining Industries, 1899-1939: A Study of Output, Employment and Productivity. Arno Press, 1972.
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