"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K4MP-F3T : 9 January 2021), Astrid Halas in household of Jens Halas, Chicago, Cook, Illinois, United States; citing enumeration district (ED) 103-2920, sheet 3A, line 34, family 48, 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 1013.
Illinois, Cook County Deaths, 1878-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVRN-M74B : 16 March 2018), Astrid J Helso, 21 Feb 1958; citing Chicago, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm
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