United States. Census Office. 6th Census, 1840, & United States. National Archives and Records Service. (1973). Schedule of mines, agriculture, commerce, manufactures, etc. of 1840 census for Illinois. National Archives.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Census Office. 6th Census, 1840, और United States. National Archives and Records Service. Schedule of Mines, Agriculture, Commerce, Manufactures, Etc. of 1840 Census for Illinois. Washington, D.C.: National Archives, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited States. Census Office. 6th Census, 1840, और United States. National Archives and Records Service. Schedule of Mines, Agriculture, Commerce, Manufactures, Etc. of 1840 Census for Illinois. National Archives, 1973.
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