"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWRY-KSH : accessed 21 Nov 2014), John Dykstra, Union Grove Township, Whiteside, Illinois, United States; citing enumeration district (ED) 98-46, sheet 9A, family 162, NARA digital publication of T627, roll 906, NARA digital publication of T627, National Archives and Records Administration, Washington, D.C.