"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K4T3-FQZ : 11 January 2021), Robert Wilentz in household of David T Wilentz, Perth Amboy, Middlesex, New Jersey, United States; citing enumeration district (ED) 12-92, sheet 1A, line 35, family 9, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2361.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4XG-PD3 : accessed 22 June 2021), Robert Wilentz in household of David Wilentz, Perth Amboy, Middlesex, New Jersey, United States; citing enumeration district (ED) ED 64, sheet 4A, line 38, family 87, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1367; FHL microfilm 2,341,102.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VMGC-ZTT : 8 January 2021), Robert N Wilentz, 23 Jul 1996; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).