"United States Census, 1930," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:XQRD-7G7 : accessed 25 January 2021), Wilbur W Smulovitch in household of Philip Smulovitch, Boston (Districts 251-500), Suffolk, Massachusetts, United States; citing enumeration district (ED) ED 418, sheet 16A, line 3, family 264, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 952; FHL microfilm 2,340,687.