Não informado. (1979). Working paper series. International Potato Center, Social Science Department.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Working Paper Series. Lima: International Potato Center, Social Science Department, 1979.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Working Paper Series. International Potato Center, Social Science Department, 1979.
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