United States. Census Office. 6th census, 1840, & United States. National Archives and Records Service. (1967). 1840 census schedules of mines, agriculture, commerce, and manufacturing for Ohio. National Archives, National Archives and Records Service, General Services Administration.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Census Office. 6th census, 1840, और United States. National Archives and Records Service. 1840 Census Schedules of Mines, Agriculture, Commerce, and Manufacturing for Ohio. Washington: National Archives, National Archives and Records Service, General Services Administration, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited States. Census Office. 6th census, 1840, और United States. National Archives and Records Service. 1840 Census Schedules of Mines, Agriculture, Commerce, and Manufacturing for Ohio. National Archives, National Archives and Records Service, General Services Administration, 1967.