"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWBJ-W4J : accessed 21 October 2015), John Zimmerman, Ward 19, Chicago, Chicago City, Cook, Illinois, United States; citing enumeration district (ED) 103-1291, sheet 11A, family 256, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 960.
"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL99-XCVV : 27 March 2017), John Zimmerman in entry for William Frederick Zimmerman, 07 Jul 1938; Chicago, Cook, Illinois, United States, reference/certificate 26127, Cook County Clerk, Cook County Courthouse, Chicago; FHL microfilm .
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