Clark, C. (1960). The conditions of economic progress (3th.ed.). Garland Pub..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClark, Colin. The Conditions of Economic Progress. 3th.ed. New York: Garland Pub., 1960.
एमएलए (9वां संस्करण) प्रशस्ति पत्रClark, Colin. The Conditions of Economic Progress. 3th.ed. Garland Pub., 1960.
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