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- [S249] Krzątka Births, 1879-1893 (Majdan Królewski), year 1888, act 60; Piotr Wyka birth and baptism.
- [S16] New York, U.S., Passenger and Crew Lists (including Castle Garden and Ellis Island), 1820-1957, Year: 1913; Arrival: New York, New York, USA; Microfilm Serial: T715, 1897-1957; Line: 17; Page Number: 68.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Yonkers Ward 4, Westchester, New York; Roll: T625_1280; Page: 2A; Enumeration District: 225.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Yonkers, Westchester, New York; Page: 3B; Enumeration District: 0041; FHL microfilm: 2341401.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Yonkers, Westchester, New York; Roll: m-t0627-02864; Page: 1B; Enumeration District: 68-51.
- [S9100] U.S., Social Security Death Index, 1935-2014, Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File.
- [S6780] New York, U.S., Death Index, 1957-1972, New York State Department of Health; Albany, Ny, Usa; New York State Death Index.
- [S7570] Krzątka Marriages, 1857-1886 (Majdan Królewski), year 1882, act 3; Wojciech Wyka and Jadwiga Ozga marriage.
- [S9647] New York, New York, U.S., Extracted Marriage Index, 1866-1937.
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