"Texas, Deaths, 1890-1976," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KS1C-49C : accessed 13 Oct 2014), Margaret Inez Tresp, 29 Mar 1968; citing certificate number 26080, State Registrar Office, Austin; FHL microfilm 2138980.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K4Q5-65X : accessed 13 Oct 2014), Margaret Tresp in household of Leo Tresp, Tract 3, Dallas, Justice Precinct 1, Dallas, Texas, United States; citing enumeration district (ED) 255-7, sheet 3A, family 59, NARA digital publication of T627, roll 4172.
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