United States. Census Office. 6th Census, 1840, & United States. National Archives and Records Service. (1974). 1840 Census schedules of mines, agriculture, commerce, and manufacturing for Massachusetts. National Archives.
Citação do estilo Chicago (17ª ed.)United States. Census Office. 6th Census, 1840, e United States. National Archives and Records Service. 1840 Census Schedules of Mines, Agriculture, Commerce, and Manufacturing for Massachusetts. Washington, D.C.: National Archives, 1974.
Citação MLA (8ª ed.)United States. Census Office. 6th Census, 1840, e United States. National Archives and Records Service. 1840 Census Schedules of Mines, Agriculture, Commerce, and Manufacturing for Massachusetts. National Archives, 1974.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.