United States. Census Office. 6th Census, 1840, & United States. National Archives and Records Service. (1973). RG 29, Schedules of mines, agriculture, commerce, manufactures, etc. 1840 for the State of Kentucky. National Archives, National Archives and Record Service, General Services Administration.
Chicago-referens (17:e uppl.)United States. Census Office. 6th Census, 1840, och United States. National Archives and Records Service. RG 29, Schedules of Mines, Agriculture, Commerce, Manufactures, Etc. 1840 for the State of Kentucky. Washington: National Archives, National Archives and Record Service, General Services Administration, 1973.
MLA-referens (8:e uppl.)United States. Census Office. 6th Census, 1840, och United States. National Archives and Records Service. RG 29, Schedules of Mines, Agriculture, Commerce, Manufactures, Etc. 1840 for the State of Kentucky. National Archives, National Archives and Record Service, General Services Administration, 1973.