"United States, GenealogyBank Historical Newspaper Obituaries, 1815-2011", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q5MP-59B8 : 4 June 2020), Mary Ann Dunn in entry for Mr Sim Dunn, 1984.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VP9V-B9D : 26 November 2014), Mary Ann Dunn, 28 Apr 1991; Department of Public Health Services, Sacramento.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JLHG-H3K : 20 May 2014), Mary Ann Dunn, 28 Apr 1991; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).