"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q239-B9M6 : 18 May 2016), William Rich Sumner, 23 Jul 1900; Evanston, Cook, Illinois, United States, reference/certificate 17271, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm .
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MKH2-N93 : accessed 11 January 2023), William R Sumner in household of Charles J Sumner, Evanston, Cook, Illinois, United States; citing enumeration district (ED) ED 101, sheet , family , NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll ; FHL microfilm .
"Illinois, Cook County Marriages, 1871-1920," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q21V-36XK : 28 November 2018), William Rich Sumner and Josephine F Buchbeit, 14 Jul 1926; citing Marriage, Cook, Illinois, United States, citing Cook County Clerk. Cook County Courthouse, Chicago; FHL microfilm 102071031.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KW4Q-B2F : 16 May 2020), William Sumner, Wilmette, New Trier Township, Cook, Illinois, United States; citing enumeration district (ED) 16-302, sheet 14B, line 72, family 334, 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 783.
Find a Grave, database and images (https://www.findagrave.com/memorial/43087423/william-rich-sumner: accessed 10 January 2023), memorial page for William Rich Sumner Sr. (23 Jul 1900–20 Aug 1960), Find a Grave Memorial ID 43087423, citing Ridgewood Cemetery, Des Plaines, Cook County, Illinois, USA; Maintained by Arleen (contributor 47159579).
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