"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MK82-6NB : accessed 7 November 2015), David Lubben in household of Louis Wieringa, Chicago Ward 35, Cook, Illinois, United States; citing enumeration district (ED) ED 1494, sheet 12A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,295.