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- [S694] Rzochów Parish Records, 1793-1947 (Rzochów), Rzochów; 1875; act 2, Józef Czajkowski birth and baptism.
- [S694] Rzochów Parish Records, 1793-1947 (Rzochów), Rzochów; 1902; act 3, Józef Czajkowski and Zuzanna Pyżikiewicz marriage.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Buffalo Ward 10, Erie, New York; Roll: T625_1102; Page: 9A; Enumeration District: 78.
- [S502] New York, U.S., State Census, 1905, New York State Archives; Albany, New York; State Population Census Schedules, 1905; Election District: E.D. 03; City: Buffalo Ward 11; County: Erie.
- [S9116] U.S., World War I Draft Registration Cards, 1917-1918, Registration State: New York; Registration County: Erie.
- [S9416] New York, U.S., State Census, 1925, New York State Archives; Albany, New York; State Population Census Schedules, 1925; Election District: 06; Assembly District: 07; City: Cheektowaga; County: Erie; Page: 65.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Cheektowaga, Erie, New York; Page: 23B; Enumeration District: 0380; FHL microfilm: 2341169.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Cheektowaga, Erie, New York; Roll: m-t0627-02527; Page: 12B; Enumeration District: 15-44.
- [S6780] New York, U.S., Death Index, 1957-1972, New York State Department of Health; Albany, Ny, Usa; New York State Death Index.
- [S694] Rzochów Parish Records, 1793-1947 (Rzochów), Rzochów; 1871; act 2, Leon Czajkowski and Rozalia Wydro marriage.
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