↑ "Illinois, Archdiocese of Chicago, Cemetery Records, 1864-1989", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q2HN-NTKZ : Tue Aug 01 02:28:51 UTC 2023), Entry for John Zeller, 08 Apr 1971.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPHX-TW5 : 26 November 2014), John Zeller, 03 Apr 1971; Department of Public Health Services, Sacramento.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPHX-TW5 : 26 November 2014), John Zeller, 03 Apr 1971; Department of Public Health Services, Sacramento.
Find a Grave, database and images (https://www.findagrave.com/memorial/177388359/john-zeller: accessed 17 August 2023), memorial page for John Zeller (16 Jan 1870–3 Apr 1971), Find A Grave: Memorial #177388359, citing All Saints Catholic Cemetery and Mausoleum, Des Plaines, Cook County, Illinois, USA; Maintained by 1RN (contributor 49649404).
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