United States. Census Office & United States. National Archives and Records Service. (1962). Index (soundex) to the population schedules of the tenth census of the United States: [Illinois]. National Archives and Records Service, General Services Administration.
Chicago-referens (17:e uppl.)United States. Census Office och United States. National Archives and Records Service. Index (soundex) to the Population Schedules of the Tenth Census of the United States: [Illinois]. Washington, [D.C.]: National Archives and Records Service, General Services Administration, 1962.
MLA-referens (8:e uppl.)United States. Census Office och United States. National Archives and Records Service. Index (soundex) to the Population Schedules of the Tenth Census of the United States: [Illinois]. National Archives and Records Service, General Services Administration, 1962.