"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JY1D-T49 : 20 May 2014), Charles M Casey, Jan 1993; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDCP-Q18 : accessed 4 May 2018), Charles Casey in household of James Casey, Rathdrum, Kootenai, Idaho, United States; citing ED 193, sheet 8B, line 89, family 94, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 291; FHL microfilm 1,820,291.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VY4P-D2M : accessed 26 August 2017), Charles M Casey, Ward 4, Coeur d'Alene, Kootenai Election Precinct, Kootenai, Idaho, United States; citing enumeration district (ED) 28-21, sheet 4A, line 39, family 92, 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 748.