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- [S249] Krzątka Births, 1879-1893 (Majdan Królewski), year 1887, act 30; Apolon Lidwiń birth and baptism.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Milwaukee, Milwaukee, Wisconsin; Page: 11B; Enumeration District: 0205; FHL microfilm: 2342326.
- [S9348] Hamburg Passenger Lists, 1850-1934, Staatsarchiv Hamburg; Hamburg, Deutschland; Hamburger Passagierlisten; Volume: 373-7 I, VIII A 1 Band 177; Page: 786; Microfilm No.: K_1794.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Milwaukee Ward 14, Milwaukee, Wisconsin; Roll: T625_2001; Page: 22B; Enumeration District: 166.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Milwaukee, Milwaukee, Wisconsin; Roll: m-t0627-04557; Page: 9A; Enumeration District: 72-383.
- [S9317] U.S., World War II Draft Registration Cards, 1942, The National Archives At St. Louis; St. Louis, Missouri; World War Ii Draft Cards (Fourth Registration) For the State of Wisconsin; Record Group Title: Records of the Selective Service System; Record Group Number: 147; Series Number: M2126; Box or Roll Number: 185.
- [S9114] 1950 United States Federal Census, National Archives at Washington, DC; Washington, D.C.; Seventeenth Census of the United States, 1950; Year: 1950; Census Place: Milwaukee, Milwaukee, Wisconsin; Roll: 807; Page: 14; Enumeration District: 73-599.
- [S9072] U.S., Find a Grave® Index, 1600s-Current.
- [S9100] U.S., Social Security Death Index, 1935-2014, Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File.
- [S9532] Wisconsin, U.S., Death Records, 1872-2004, Wisconsin Department of Health Services; Madison, WI, USA; Wisconsin Death Records, 1959-1978.
- [S449] Wisconsin, U.S., Death Index, 1959-1997.
- [S7570] Krzątka Marriages, 1857-1886 (Majdan Królewski), year 1873, act 21; Wojciech Lidwin and Agnieszka Gurdak marriage.
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