↑ "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J2QF-YYF : 8 January 2021), Charles A Ballard, 17 Jan 2001; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XHW5-Z5B : accessed 1 May 2023), Charles Ballard in household of John A Ballard, Philadelphia (Districts 0751-1000), Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 780, sheet 4A, line 16, family 69, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2126; FHL microfilm 2,341,860.