APA (7th ed.) Citation

United States. Census Office. 6th census, 1840, United States. Census Office. 6th census, 1840, & United States. National Archives and Records Service. (1967). Population schedules of the sixth census of the United States, 1840. National Archives, National Archives and Records Service.

Chicago Style (17th ed.) Citation

United States. Census Office. 6th census, 1840, 1840 United States. Census Office. 6th census, and United States. National Archives and Records Service. Population Schedules of the Sixth Census of the United States, 1840. Washington: National Archives, National Archives and Records Service, 1967.

MLA (8th ed.) Citation

United States. Census Office. 6th census, 1840, et al. Population Schedules of the Sixth Census of the United States, 1840. National Archives, National Archives and Records Service, 1967.

Warning: These citations may not always be 100% accurate.