Não informado. (1971). Bulletin of Economic Research. University of Hull, Department of Economics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of Economic Research. Hull, Inglaterra: University of Hull, Department of Economics, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of Economic Research. University of Hull, Department of Economics, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.