| Sources |
- [S249] Krzątka Births, 1879-1893 (Majdan Królewski), year 1887, act 83; Karol Kopeć birth and baptism.
- [S9444] Michigan, U.S., Marriage Records, 1867-1952, Michigan Department of Community Health, Division of Vital Records and Health Statistics; Lansing, MI, USA; Michigan, Marriage Records, 1867-1952; Film: 108; Film Description: 1911 Washtenaw-1912 Barry.
- [S5832] Michigan, U.S., County Marriage Records, 1822-1940.
- [S9317] U.S., World War II Draft Registration Cards, 1942, The National Archives at St. Louis; St. Louis, Missouri; World War II Draft Cards (4th Registration) for the State of Michigan; Record Group Title: Records of the Selective Service System; Record Group Number: 147.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Detroit, Wayne, Michigan; Page: 7A; Enumeration District: 0642; FHL microfilm: 2340793.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Detroit Ward 18, Wayne, Michigan; Roll: T625_817; Page: 22B; Enumeration District: 573.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Detroit, Wayne, Michigan; Roll: m-t0627-01875; Page: 7A; Enumeration District: 84-1173.
- [S9100] U.S., Social Security Death Index, 1935-2014, Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File.
- [S9440] Michigan, U.S., Death Records, 1867-1952, Michigan Department of Community Health, Division for Vital Records and Health Statistics; Lansing, Michigan; Death Records.
- [S6148] Ohio, U.S., County Marriage Records, 1774-1993.
- [S9078] U.S., Social Security Applications and Claims Index, 1936-2007.
- [S9444] Michigan, U.S., Marriage Records, 1867-1952, Michigan Department of Community Health, Division of Vital Records and Health Statistics; Lansing, MI, USA; Michigan, Marriage Records, 1867-1952; Film: 303; Film Title: 82 Wayne 236770-240059; Film Description: Wayne (Dates TBD).
- [S9317] U.S., World War II Draft Registration Cards, 1942, The National Archives at St. Louis; St. Louis, Missouri; World War II Draft Cards (4th Registration) for the State of Michigan; Record Group Title: Records of the Selective Service System, 1926-1975; Record Group Number: 147.
- [S9100] U.S., Social Security Death Index, 1935-2014, Number: 373-03-3919; Issue State: Michigan; Issue Date: Before 1951.
- [S226] Majdan Królewski Parish Records, 1895-1899 (Majdan Królewski), Krzątka year 1896, act 15; Jakub Kopeć death and burial.
- [S7570] Krzątka Marriages, 1857-1886 (Majdan Królewski), year 1874, act 18; Jakub Kopeć and Franciszka Gil marriage.
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