↑ Find a Grave, database and images (https://www.findagrave.com/memorial/34963073/roy_philemon-johnson: accessed March 25, 2024), memorial page for Dr Roy Philemon Johnson (19 Nov 1894–2 Jul 1969), Find A Grave: Memorial #34963073, citing Prairie Home Cemetery, Holdrege, Phelps County, Nebraska, USA; Maintained by The Busbooms (contributor 48605773).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JY1R-HZ9 : 10 January 2021), Roy Johnson, Jul 1969; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).