"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XS1Q-59G : accessed 30 Sep 2012), Erma Sievers in household of William F Sievers, Olive, Madison, Illinois; citing enumeration district (ED) 0081, sheet 3B, family 68, NARA microfilm publication T626, roll 541.