Williams, O. P., & Adrian, C. R. (1963). Four cities: A study in comprative policy making. University of Pennsylvania Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Oliver P., और Charles R. Adrian. Four Cities: A Study in Comprative Policy Making. Philadelphia: University of Pennsylvania Press, 1963.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilliams, Oliver P., और Charles R. Adrian. Four Cities: A Study in Comprative Policy Making. University of Pennsylvania Press, 1963.
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