freeman, C. (1982). The economics of industrial innovation (2th. ed.). Christopher freeman.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रfreeman, Christopher. The Economics of Industrial Innovation. 2th. ed. london: Christopher freeman, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रfreeman, Christopher. The Economics of Industrial Innovation. 2th. ed. Christopher freeman, 1982.
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