"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWC6-6R2 : accessed 30 Sep 2012), William F Sievers, Olive Township, Madison, Illinois, United States; citing enumeration district (ED) 60-105, sheet 3B, family 56, NARA digital publication T627, roll 851.