"United States Census, 1920," index and images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:MFML-TR3 : accessed 15 May 2015), Eva Servaes in household of Ignacio Drago, Boston Ward 10, Suffolk, Massachusetts, United States; citing sheet 13B, family 413, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,734.