"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWYD-KB3 : accessed 06 May 2013), Margaret L Alm in household of Berndt Waldener Alm, Ward 9, Chicago, Chicago City, Cook, Illinois, United States; citing enumeration district (ED) 103-578, sheet 11A, family 234, NARA digital publication T627, roll 939.