Northrup, H. R. (1969). The Negro in the rubber tire industry. Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press.
Citace podle Chicago (17th ed.)Northrup, Herbert R. The Negro in the Rubber Tire Industry. Philadelphia: Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, 1969.
Citace podle MLA (8th ed.)Northrup, Herbert R. The Negro in the Rubber Tire Industry. Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press, 1969.
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