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- [S241] Majdan Births, 1865-1891 (Majdan Królewski), year 1882, act 37; Józef Wojkowski birth and baptism.
- [S8760] Pennsylvania, U.S., Federal Naturalization Records, 1795-1945, The National Archives in Washington, D.C.; Philadelphia, Pennsylvania; Record Group Title: Records of District Courts of the United States; Record Group Number: 21.
- [S8760] Pennsylvania, U.S., Federal Naturalization Records, 1795-1945, The National Archives at Philadelphia; Philadelphia, Pennsylvania; Record Group Title: Records of District Courts of the United States; Record Group Number: 21.
- [S9642] New York, U.S., State Census, 1915, New York State Archives; Albany, New York; State Population Census Schedules, 1915; Election District: 47; Assembly District: 22; City: New York; County: Kings; Page: 11.
- [S9116] U.S., World War I Draft Registration Cards, 1917-1918, Registration State: New York; Registration County: Kings.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Brooklyn, Kings, New York; Page: 15A; Enumeration District: 0491; FHL microfilm: 2341275.
- [S9115] New York, New York, U.S., Index to Death Certificates, 1862-1948, New York City Department of Records & Information Services; New York City, New York; New York City Death Certificates; Borough: Queens; Year: 1939.
- [S9291] New York, New York, U.S., Extracted Death Index, 1862-1948.
- [S9072] U.S., Find a Grave® Index, 1600s-Current.
- [S239] Majdan Marriages, 1854-1901 (Majdan Królewski), year 1881, act 22; Adam Wojkowski and Katarzyna Rębisz marriage.
- [S9647] New York, New York, U.S., Extracted Marriage Index, 1866-1937.
- [S9292] New York, New York, U.S., Marriage License Indexes, 1907-2018, New York City Municipal Archives; New York, New York; Borough: Brooklyn.
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