Ancestry.com. 1920 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2010. Year: 1920; Census Place: Fargo Ward 6, Cass, North Dakota; Roll: T625_1332; Page: 22A; Enumeration District: 19
Ancestry.com. North Dakota, U.S., Territorial and State Censuses, 1885, 1915, 1925 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2008.
Find a Grave, database and images (https://www.findagrave.com/memorial/115526815/willis-charles-arhart : accessed 11 November 2021), memorial page for Willis Charles Arhart (14 Feb 1913–9 May 1921), Find a Grave Memorial ID 115526815, citing Riverside Cemetery, Fargo, Cass County, North Dakota, USA ; Maintained by sleuthesthedead (contributor 46867008).
Ancestry.com. U.S., Social Security Death Index, 1935-2014 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2014.
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