"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQ1S-H8D : accessed 2 May 2020), Ronald B Holmes in household of Bruce W Holmes, Armada, Macomb, Michigan, United States; citing enumeration district (ED) ED 2, sheet 5A, line 6, family 97, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1008; FHL microfilm 2,340,743.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4GC-QFD : 6 December 2019), Ronald Holmes in household of Bruce Holmes, Armada Township, Macomb, Michigan, United States; citing enumeration district (ED) 50-2, sheet 3A, line 2, family 41, 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 1782.
Ancestry.com. Michigan, Marriage Records, 1867-1952 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015. Michigan Department of Community Health, Division of Vital Records and Health Statistics; Lansing, MI, USA; Michigan, Marriage Records, 1867-1952; Film: 141; Film Title: 50 Macomb 17370-20669; Film Description: Macomb (1946-1950) Ancestry Record 9093 #1962438
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V37P-GMH : 20 May 2014), Ronald B Holmes, 27 Jan 2002; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).