Não informado. (1978). QUARTERLY ECONOMIC REVIEW OF BAHRAIN, QATAR, OMAN, THE YEMENS. Economist Intelligence Unit.
Chicago-referens (17:e uppl.)Não informado. QUARTERLY ECONOMIC REVIEW OF BAHRAIN, QATAR, OMAN, THE YEMENS. London: Economist Intelligence Unit, 1978.
MLA-referens (8:e uppl.)Não informado. QUARTERLY ECONOMIC REVIEW OF BAHRAIN, QATAR, OMAN, THE YEMENS. Economist Intelligence Unit, 1978.
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