"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWYX-CL9 : accessed 1 January 2015), John Bos, Ward 9, Chicago, Chicago City, Cook, Illinois, United States; citing enumeration district (ED) 103-584, sheet 1B, family 17, NARA digital publication of T627, roll 939, NARA digital publication of T627, National Archives and Records Administration, Washington, D.C.