(1974). world factbook 1974: A handbook of economics, political and geographic intelligence. Massachusetts Publishing Science Group, Inc.
Παραπομπή Chicago StyleWorld Factbook 1974: A Handbook of Economics, Political and Geographic Intelligence. Acton: Massachusetts Publishing Science Group, Inc, 1974.
Παραπομπή MLAWorld Factbook 1974: A Handbook of Economics, Political and Geographic Intelligence. Massachusetts Publishing Science Group, Inc, 1974.
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