Não informado. (1974). Journal of Rural Economics and Development. University of Ibadan, Department of Agricultural Extension Services.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Rural Economics and Development. Ibadan, Nigeria: University of Ibadan, Department of Agricultural Extension Services, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Rural Economics and Development. University of Ibadan, Department of Agricultural Extension Services, 1974.
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