Não informado. (1939). Manchester school of economic and social studies. Basil Blackwell.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Manchester School of Economic and Social Studies. Oxford, Inglaterra: Basil Blackwell, 1939.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Manchester School of Economic and Social Studies. Basil Blackwell, 1939.
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