"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M573-CLK : accessed 18 June 2020), Morris Kaufman in household of Soloman Kaufman, Manhattan Ward 12, New York, New York, United States; citing enumeration district (ED) ED 468, sheet 12A, family 252, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1019; FHL microfilm 1,375,032.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJB5-RV1 : accessed 18 June 2020), Morris Kaufman in household of Solomon Haufman, Manhattan Assembly District 15, New York, New York, United States; citing ED 1103, sheet 15B, line 82, family 320, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1214; FHL microfilm 1,821,214.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X42V-1RY : accessed 18 June 2020), Morris Kaufman in household of Solomon Kaufman, Manhattan (Districts 0501-0750), New York, New York, United States; citing enumeration district (ED) ED 534, sheet 4A, line 6, family 198, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1566; FHL microfilm 2,341,301.