Não informado. (2013). Bulletin of the Illinois Geographical Society. Illinois Geographical Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Illinois Geographical Society. Chicago, Ill: Illinois Geographical Society, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Illinois Geographical Society. Illinois Geographical Society, 2013.
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