"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMFD-RZZ : accessed 2 October 2021), Thurman Ball in household of Bennie Ball, Central City, Muhlenberg, Kentucky, United States; citing enumeration district (ED) ED 7, sheet 31B, line 82, family 671, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 771; FHL microfilm 2,340,506.