"California Birth Index, 1905-1995," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VGH6-P7D : 27 November 2014), Joan Adele Mohler, 16 May 1928; citing Los Angeles, California, United States, Department of Health Services, Vital Statistics Department, Sacramento.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XC8B-CRB : accessed 14 March 2021), Joan Mohler in household of L Ingomar Mohler, San Antonio, Los Angeles, California, United States; citing enumeration district (ED) ED 1367, sheet 8B, line 51, family 217, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 172; FHL microfilm 2,339,907.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K9W6-FGG : 5 January 2021), Joan A Mohler in household of Lee L Mohler, San Antonio Judicial Township, Los Angeles, California, United States; citing enumeration district (ED) 19-630, sheet 6A, line 31, family 247, 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 249.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JBS4-D6T : 11 January 2021), Joan Galstaun, Nov 1977; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).