"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2MS-LSF : accessed 7 November 2021), William C Geller in household of Frank J Geller, Dallas Ward 10, Dallas, Texas, United States; citing enumeration district (ED) ED 78, sheet 12A, family 14, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1544; FHL microfilm 1,375,557.
"Texas Death Index, 1964-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JVNM-SYM : 5 December 2014), William C Geller, Dallas, Texas, United States; citing Department of State Health Services, Austin.