sack, K., & linsel, h. (1966). planning of technical progress in socialist countries: Planning of research and development. the institute of national planning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रsack, K., और hermann linsel. Planning of Technical Progress in Socialist Countries: Planning of Research and Development. cairo: the institute of national planning, 1966.
एमएलए (9वां संस्करण) प्रशस्ति पत्रsack, K., और hermann linsel. Planning of Technical Progress in Socialist Countries: Planning of Research and Development. the institute of national planning, 1966.
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