Não informado. (1953). Business topics. Michigan State University, Bureau of Business and Economic Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Business Topics. East Lansing, Mich: Michigan State University, Bureau of Business and Economic Research, 1953.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Business Topics. Michigan State University, Bureau of Business and Economic Research, 1953.
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