Não informado. (1968). Hokudai Economic Papers. Hokkaido University, Faculty of Economics and Business Administration.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Hokudai Economic Papers. Hokkaido, Japão: Hokkaido University, Faculty of Economics and Business Administration, 1968.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Hokudai Economic Papers. Hokkaido University, Faculty of Economics and Business Administration, 1968.
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