↑ "New York, New York City Births, 1846-1909," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2WZL-DS5 : 11 February 2018), Esther Sternberg in entry for William Zimmerman, 07 Jun 1908; citing Manhattan, New York, New York, United States, reference 20185 New York Municipal Archives, New York; FHL microfilm 2,022,279.
↑ 1910 United States Federal Census, Year: 1910; Census Place: Brooklyn Ward 19, Kings, New York; Roll: T624_967; Page: 10A; Enumeration District: 0429; FHL microfilm: 1374980, Esther Zimerman [sic], age 25, born in Austria Poland; Ancestry.com online database accessed 10 July 2023.
↑ 1920 United States Federal Census, Year: 1920; Census Place: Brooklyn Assembly District 18, Kings, New York; Roll: T625_1172; Page: 15A; Enumeration District: 1102, Esther Zimmerman, age 35, born in Austria; Ancestry.com online database accessed 10 July 2023.
↑ 1930 United States Federal Census, Year: 1930; Census Place: Mount Vernon, Westchester, New York; Page: 15A; Enumeration District: 0210, William Zimmerman, born 1909 in New York; Ancestry.com online database accessed 10 July 2023.
↑ 1940 United States Federal Census, Year: 1940; Census Place: Yorktown, Westchester, New York; Roll: m-t0627-02815; Page: 14B; Enumeration District: 60-388, William Zimmerman, age 31, born in New York; Ancestry.com online database accessed 10 July 2023.
↑ U.S., Social Security Death Index, Issue State: New York; Issue Date: Before 1951. Source Information, William Zimmerman, born 07 June 1908, died November 1980; Ancestry.com online database accessed 10 July 2023.
↑ "North Carolina Deaths, 1931-1994," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FG2K-YWQ : 18 July 2017), Ester Sternberg in entry for William Zimmerman, 28 Nov 1980; citing Pinehurst, Moore, North Carolina, v 42B cn 42818, State Department of Archives and History, Raleigh; FHL microfilm 1,984,634.
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