Birth (1926) - "Illinois, Cook County, Birth Certificates, 1871-1949," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKDC-MPCZ : 18 May 2016), William Robert Ritchie, 25 May 1926; Chicago, Cook, Illinois, United States, reference/certificate 23677, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm .
1930 Census - "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSTX-1N7 : accessed 21 May 2021), William Ritchie in household of Matthew Ritchie, Chicago (Districts 0251-0500), Cook, Illinois, United States; citing enumeration district (ED) ED 314, sheet 7A, line 41, family 110, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 426; FHL microfilm 2,340,161.
1940 Census - "United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWYX-PDR : 8 January 2021), William Ritchie in household of Matthew Ritchie, Chicago, Cook, Illinois, United States; citing enumeration district (ED) 103-658, sheet 64A, line 40, family 365, 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 941.
Death (1980) - "Illinois, Cook County Deaths, 1871-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV9V-CN6S : 17 March 2020), William Ritchie, 28 Mar 1980; citing Chicago, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm .
Death (1980) - "Illinois, Cook County Deaths, 1871-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q23W-CKWV : 18 March 2018), William Ritchie, 28 Mar 1980; citing Chicago, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm .
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