"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWL7-Y78 : 9 January 2021), Evert Knisley in household of Clyde R Knisley, Cynthiana, Perry Township, Pike, Ohio, United States; citing enumeration district (ED) 66-13, sheet 8A, line 12, family 148, 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 3129.