Παραπομπή APA

Olsen, E. (1971). International trade theory and regional income differences: United States 1880-1950. Amsterdam: North-Holland Pub. Co..

Παραπομπή Chicago Style

Olsen, Erling. International Trade Theory and Regional Income Differences: United States 1880-1950. Amsterdam: North-Holland Pub. Co., 1971.

Παραπομπή MLA

Olsen, Erling. International Trade Theory and Regional Income Differences: United States 1880-1950. Amsterdam: North-Holland Pub. Co., 1971.

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