Não informado. (1975). Economic Review. People's Bank, Research Department.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Economic Review. Colombo: People's Bank, Research Department, 1975.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Economic Review. People's Bank, Research Department, 1975.
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