"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD5B-C1L : accessed 18 March 2019), Richard L Altfeld in household of David S Altfeld, Elyria Ward 3, Lorain, Ohio, United States; citing ED 46, sheet 21B, line 74, family 508, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1406; FHL microfilm 1,821,406.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X447-6JD : accessed 18 March 2019), Richard L Altfeld in household of David S Altfeld, Elyria, Lorain, Ohio, United States; citing enumeration district (ED) ED 46, sheet 12A, line 45, family 319, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1831; FHL microfilm 2,341,565.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWFG-L6S : 14 March 2018), Richard Altfeld in household of David Altfeld, Ward 5, Elyria City, Elyria Township, Lorain, Ohio, United States; citing enumeration district (ED) 47-67, sheet 11A, line 8, family 324, 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 3103.
"United States World War II Army Enlistment Records, 1938-1946," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8YZ-ZZR : 5 December 2014), Richard L Altfeld, enlisted 12 Jun 1941, Cleveland, Ohio, United States; citing "Electronic Army Serial Number Merged File, ca. 1938-1946," database, The National Archives: Access to Archival Databases (AAD) (http://aad.archives.gov : National Archives and Records Administration, 2002); NARA NAID 1263923, National Archives at College Park, Maryland.
"Virginia, Marriage Certificates, 1936-1988," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV1S-VFYC : 10 January 2019), Richard Lewis Altfeld in entry for Harry Daniel Littman and Barbara Ann Altfeld, 26 Mar 1977; from "Virginia, Marriage Records, 1700-1850," database and images, Ancestry (http://www.ancestry.com : 2012); citing Norfolk, , Virginia, United States, certificate 77 007292, Virginia Department of Health, Richmond.