Mangum, G. L. (1964). The Operating Engineers: The economic history of a trade union. Harvard University Press.
Citace podle Chicago (17th ed.)Mangum, Garth L. The Operating Engineers: The Economic History of a Trade Union. Cambridge: Harvard University Press, 1964.
Citace podle MLA (9th ed.)Mangum, Garth L. The Operating Engineers: The Economic History of a Trade Union. Harvard University Press, 1964.
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