Não informado. (1989). Proceedings of the World Bank Annual Conference on Development Economics. World Bank.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the World Bank Annual Conference on Development Economics. Washington: World Bank, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the World Bank Annual Conference on Development Economics. World Bank, 1989.
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