"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XSG6-99X : accessed 2 January 2023), Richard Arrington, Chicago (Districts 0751-1000), Cook, Illinois, United States; citing enumeration district (ED) ED 922, sheet 1A, line 46, family 13, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 456; FHL microfilm 2,340,191.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWBF-SJ3 : 9 January 2021), Richard Arrington, Chicago, Cook, Illinois, United States; citing enumeration district (ED) 103-1361, sheet 7B, line 52, family 172, 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 962.
"Illinois, Cook County, Birth Certificates, 1871-1949", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QGCX-16NH : 10 October 2022), Richard Arrington in entry for birth of son Marshall Arrington, 1936.