"Illinois, Cook County Deaths, 1878-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2MX-M798 : 18 March 2018), Matthew F Brennan, 13 May 1964; citing Chicago, Cook, Illinois, United States, source reference , record number , Cook County Courthouse, Chicago; FHL microfilm .
Find a Grave, database and images (https://www.findagrave.com/memorial/195004052/matthew-finnon-brennan: accessed 25 December 2023), memorial page for Matthew Finnon Brennan (20 Jan 1897–13 May 1964), Find a Grave Memorial ID 195004052, citing All Saints Catholic Cemetery and Mausoleum, Des Plaines, Cook County, Illinois, USA; Maintained by Rob Gomoluh (contributor 46984278).
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