"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9XR-MZ4 : accessed 29 November 2019), Bertha Sanders in household of Clarence Sanders, Beat 3, Panola, Mississippi, United States; citing enumeration district (ED) 81, sheet 4A, family 60, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,824.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNT4-TKZ : accessed 29 November 2019), Bertha M Sanders in household of Clare Sanders, Courtland, Panola, Mississippi, United States; citing ED 65, sheet 9A, line 7, family 169, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 890; FHL microfilm 1,820,890.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMB5-4VD : accessed 29 November 2019), Bertha M Sanders in household of C L Sanders, Beat 3, DeSoto, Mississippi, United States; citing enumeration district (ED) ED 10, sheet 9A, line 13, family 226, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1144; FHL microfilm 2,340,879.