Não informado. (1968). Food Research Institute studies in agricultural economics, trade and development. Stanford University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Food Research Institute Studies in Agricultural Economics, Trade and Development. Stanford, Conn: Stanford University, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Food Research Institute Studies in Agricultural Economics, Trade and Development. Stanford University, 1968.
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