Não informado. (1971). IDS Communication. University of Sussex, Institute of Development Studies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. IDS Communication. Brighton, Inglaterra: University of Sussex, Institute of Development Studies, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. IDS Communication. University of Sussex, Institute of Development Studies, 1971.
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