"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWF7-YXP : 9 January 2021), Effama Cochrane in household of Samuel Cochrane, Oak Hill, Jefferson Township, Jackson, Ohio, United States; citing enumeration district (ED) 40-7, sheet 2A, line 4, family 22, 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 3089.