"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKCF-Y8C : accessed 18 August 2015), Harry Huizinga, Chicago Ward 11, Cook, Illinois, United States; citing enumeration district (ED) 551, sheet 4B, family 79, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,265.