"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K4JY-5QR : 10 January 2021), Roger Clifford in household of Jeremiah Clifford, Boston, Suffolk, Massachusetts, United States; citing enumeration district (ED) 15-412, sheet 8B, line 66, family 154, 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 1669.