.Herbert, D. T., & .Smith, D. M. (1979). Social problems and the city: Geographical perspectives. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र.Herbert, David T., और David M. .Smith. Social Problems and the City: Geographical Perspectives. New York : Oxford: Oxford University Press, 1979.
एमएलए (9वां संस्करण) प्रशस्ति पत्र.Herbert, David T., और David M. .Smith. Social Problems and the City: Geographical Perspectives. Oxford University Press, 1979.