Waller-Joos-Stetzler
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWR6-9MZ : accessed 15 January 2016), Ralph Williamson in household of John Williamson, Dawson Township, McLean, Illinois, United States; citing enumeration district (ED) 57-49, sheet 5B, family 89, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 842.
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Title "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWR6-9MZ : accessed 15 January 2016), Ralph Williamson in household of John Williamson, Dawson Township, McLean, Illinois, United States; citing enumeration district (ED) 57-49, sheet 5B, family 89, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 842. Short Title Ralph Williamson in household of John Williamson, "United States Census, 1940" Source ID S2557 Linked to (1) Williamson, Ralph James