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- [S9348] Hamburg Passenger Lists, 1850-1934, Staatsarchiv Hamburg; Hamburg, Deutschland; Hamburger Passagierlisten; Volume: 373-7 I, VIII A 1 Band 164; Page: 551; Microfilm No.: K_1787.
- [S704] Dęba & Poręby Dębskie Births, 1858-1884 (Majdan Królewski), year 1879, act 1; Karolina Gurdak birth and baptism.
- [S5244] Miechocin Parish Records, 1896-1903 (Miechocin), Alfredówka year 1901, act 7; Mateusz Radek and Karolina Gurdak marriage.
- [S9642] New York, U.S., State Census, 1915, New York State Archives; Albany, New York; State Population Census Schedules, 1915; Election District: 07; Assembly District: 14; City: New York; County: Kings; Page: 12.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Wallington, Bergen, New Jersey; Roll: T625_1020; Page: 8A; Enumeration District: 122.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Brooklyn, Kings, New York; Page: 17B; Enumeration District: 0225; FHL microfilm: 2341254.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: New York, Kings, New York; Roll: m-t0627-02585; Page: 4A; Enumeration District: 24-1512.
- [S9308] U.S., City Directories, 1822-1995.
- [S9647] New York, New York, U.S., Extracted Marriage Index, 1866-1937.
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