"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K4MZ-FGZ : accessed 15 Aug 2014), Joseph Piskozub, Ward 38, Chicago, Chicago City, Cook, Illinois, United States; citing enumeration district (ED) 103-2424, sheet 9B, family 189, NARA digital publication of T627, roll 998.