"South Dakota State Census, 1935," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV4X-FQW : 14 November 2014), William Roy Berry, , Pennington, South Dakota; citing p. 255, State Historical Society, Pierre; FHL microfilm 2,369,252.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V191-LCQ : accessed 27 September 2016), William Berry in household of Roy Berry, Ward 4, Rapid City, Rapid City, Pennington, South Dakota, United States; citing enumeration district (ED) 52-27A, sheet 10A, family 194, 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 3865.
"South Dakota State Census, 1945," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLBV-JSZ : 14 November 2014), William Roy Berry, Ward 1, Pennington, South Dakota; citing p. , State Historical Society, Pierre; FHL microfilm 2,370,801.
"South Dakota, Department of Health, Index to Births 1843-1914 and Marriages 1950-2014," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKDD-CJKH : 2 September 2015), William Berry and Maxine Willhoite, 07 Jan 1952; citing Marriage, Pennington, South Dakota, United States, South Dakota Department of Health, Pierre; FHL microfilm .
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J1TG-D46 : 20 May 2014), William Barry, Dec 1975; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).