"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K4MK-GM2 : accessed 04 Nov 2013), Lillian Mueller, Ward 44, Chicago, Chicago City, Cook, Illinois, United States; citing enumeration district (ED) 103-2829, sheet 4B, family 81, NARA digital publication of T627, roll 1010.