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- [S9642] New York, U.S., State Census, 1915, New York State Archives; Albany, New York; State Population Census Schedules, 1915; Election District: 01; Assembly District: 02; City: Poughkeepsie Ward 01; County: Dutchess; Page: 42.
- [S9100] U.S., Social Security Death Index, 1935-2014, Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File.
- [S9389] 1910 United States Federal Census, Year: 1910; Census Place: Poughkeepsie Ward 1, Dutchess, New York; Roll: T624_936; Page: 10A; Enumeration District: 0061; FHL microfilm: 1374949.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Poughkeepsie Ward 1, Dutchess, New York; Roll: T625_1098; Page: 6B; Enumeration District: 34.
- [S9416] New York, U.S., State Census, 1925, New York State Archives; Albany, New York; State Population Census Schedules, 1925; Election District: 01; Assembly District: 02; City: Poughkeepsie Ward 01; County: Dutchess; Page: 35.
- [S121] 1900 United States Federal Census, Year: 1900; Census Place: Poughkeepsie Ward 1, Dutchess, New York; Roll: 1023; Page: 14; Enumeration District: 0019; FHL microfilm: 1241023.
- [S370] Nadbrzezie Marriages, 1853-1891 (Trześń), year 1878, act 5; Jan Cygan and Florentina Siwiec marriage.
- [S86] New York, U.S., Marriage Index, 1881-1967, New York State Department of Health; Albany, NY, USA; New York State Marriage Index.
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