"Pennsylvania, World War II Draft Registration Cards, 1940-1945", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q2SV-MGWB : Fri Feb 23 21:26:41 UTC 2024), Entry for Clyde Hilbert Williams and Ruth Elizabeth Williams, 16 Oct 1940.
Clyde H Williams, "United States 1950 Census" "United States 1950 Census", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6XBP-9RD5 : Tue Mar 19 23:53:37 UTC 2024), Entry for Clyde H Williams and Ruth E Williams, 2 April 1950.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPVV-9YJ : 26 November 2014), Clyde H Williams, 23 Jul 1993; Department of Public Health Services, Sacramento.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JY37-K47 : 8 January 2021), Clyde H Williams, 23 Jul 1993; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).