Waller-Joos-Stetzler
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJCT-L5X : accessed 13 Mar 2014), Elmer C Knapp in household of Wm M Knapp, Deer Creek, Tazewell, Illinois, United States; citing sheet 5B, family 91, NARA microfilm publication T625, FHL microfilm 1820410.
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Title "United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJCT-L5X : accessed 13 Mar 2014), Elmer C Knapp in household of Wm M Knapp, Deer Creek, Tazewell, Illinois, United States; citing sheet 5B, family 91, NARA microfilm publication T625, FHL microfilm 1820410. Short Title Elmer C Knapp in household of Wm M Knapp, "United States Census, 1920" Source ID S524 Linked to (1) Knapp, Elmer C