"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHP7-CQT : accessed 13 January 2018), Jacob D Furnish in household of Furnish, East Owenton, Owen, Kentucky, United States; citing ED 135, sheet 3A, line 25, family 73, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 594; FHL microfilm 1,820,594.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMFF-WWH : accessed 13 January 2018), Jacob D Furnish in household of Absolum Furnish, District 2, Owen, Kentucky, United States; citing enumeration district (ED) ED 8, sheet 6B, line 81, family 144, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 772; FHL microfilm 2,340,507.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J2T3-X2L : 20 May 2014), Jacob D Furnish, 11 Feb 1998; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).