Bollens, J. C. (1957). Special district governments in the United States. University of California Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBollens, John Constantinus. Special District Governments in the United States. Berkeley: University of California Press, 1957.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBollens, John Constantinus. Special District Governments in the United States. University of California Press, 1957.
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