"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2XL-L2Q : accessed 26 October 2020), Frank A Zonsal in household of Frank Bonsal, Election District 3, Baltimore, Maryland, United States; citing enumeration district (ED) ED 13, sheet 15A, family 290, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 551; FHL microfilm 1,374,564.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QY-CC6 : accessed 26 October 2020), Frank A Bonsal, Jr in household of Frank A Bonsal, Marshall, Harford, Maryland, United States; citing ED 98, sheet 6A, line 8, family 95, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 675; FHL microfilm 1,820,675.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X3WS-1FC : accessed 26 October 2020), Frank A Bonsal Jr. in household of Charles A Heiser Sr., Election District 04, Baltimore, Maryland, United States; citing enumeration district (ED) ED 24, sheet 5A, line 8, family 95, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 846; FHL microfilm 2,340,581.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K762-8HJ : 28 February 2020), Frank Bonsal, Election District 8, Baltimore, Maryland, United States; citing enumeration district (ED) 3-50, sheet 26B, line 45, family 05, 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 1504.
Find a Grave, database and images (https://www.findagrave.com : accessed 26 October 2020), memorial page for Frank Adair Bonsal (29 Apr 1905–2 Dec 1980), Find A Grave: Memorial #68175300, citing Saint Johns Episcopal Church Cemetery, Reisterstown, Baltimore County, Maryland, USA ; Maintained by Reb (contributor 47398073) .
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