[S333] FamilySearch, https://www.familysearch.org/ark:/61903/1:1:MK69-RV3.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MK69-RV3), John Hafflander, Waukegan Ward 1, Lake, Illinois, United States; citing enumeration district (ED) ED 111, sheet 25B, family 503, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 302; FHL microfilm 1,374,315.