Johnson, C. (1970). Changes in Communist systems. Stanford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Chalmers. Changes in Communist Systems. Stanford University Press, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJohnson, Chalmers. Changes in Communist Systems. Stanford University Press, 1970.
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