Não informado. (1973). Applied Sciences and Development. Institute for Scientific Co-operation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Applied Sciences and Development. Tubingen, Alemanha: Institute for Scientific Co-operation, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Applied Sciences and Development. Institute for Scientific Co-operation, 1973.
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