Não informado. (1971). Bulletin of Economic Research. University of Hull, Department of Economics.
Chicago-referens (17:e uppl.)Não informado. Bulletin of Economic Research. Hull, Inglaterra: University of Hull, Department of Economics, 1971.
MLA-referens (8:e uppl.)Não informado. Bulletin of Economic Research. University of Hull, Department of Economics, 1971.
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