"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7SM-12B : accessed 27 April 2018), Ethel L Knauf in household of Fred Knauf, Ward 1, Owego, Owego Town, Tioga, New York, United States; citing enumeration district (ED) 54-21, sheet 62A, line 16, family 182, 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 2791.