"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MP2S-MF4 : accessed 17 January 2022), Albert Rubin in household of Nathan Rubin, Milwaukee Ward 6, Milwaukee, Wisconsin, United States; citing enumeration district (ED) ED 54, sheet 12A, family 249, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1722; FHL microfilm 1,375,735.
"Wisconsin, Milwaukee Petitions for Naturalization, 1848-1991," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:C4WL-3VT2 : 20 November 2020), Albert Rubin, 16 May 1917; citing Naturalization Petition and Record, 9/1/1848 - 5/9/1991, NAID 7267811. Records of District courts of the United States, 1685-2009, RG 21. National Archives at Chicago, Illinois.