Waller-Joos-Stetzler
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWZ5-L1W : accessed 13 Mar 2014), Albert Knapp in household of William Knapp, Deer Creek Township, Tazewell, Illinois, United States; citing enumeration district (ED) 90-5, sheet 5B, family 71, NARA digital publication of T627, roll 894.
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Title "United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWZ5-L1W : accessed 13 Mar 2014), Albert Knapp in household of William Knapp, Deer Creek Township, Tazewell, Illinois, United States; citing enumeration district (ED) 90-5, sheet 5B, family 71, NARA digital publication of T627, roll 894. Short Title Albert Knapp in household of William Knapp, "United States Census, 1940" Source ID S542 Linked to (1) Knapp, Albert R