2. https://archive.org/details/GeorgeAbramovichKoval/page/n435/mode/2up (вх. 25.04.20)
3. https://archive.org/details/GeorgeAbramovichKoval/page/n459/mode/1up (вх. 26.04.20)
4. https://archive.org/details/GeorgeAbramovichKoval/page/n460/mode/1up (вх. 26.04.20)
5. https://archive.org/details/GeorgeAbramovichKoval/page/n461/mode/1up (вх. 26.04.20)
6. https://archive.org/details/GeorgeAbramovichKoval/page/n462/mode/1up (вх. 26.04.20)
7. https://archive.org/details/GeorgeAbramovichKoval/page/n463/mode/1up (вх. 26.04.20)
8. https://archive.org/details/GeorgeAbramovichKoval/page/n464/mode/1up (вх. 26.04.20)
9. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n15/mode/2up (вх. 22.04.20).
10. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n13/mode/2up (вх. 12.04.20).
11. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n19/mode/2up (вх. 12.04.20).
12. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n11/mode/2up (вх. 21.04.20)
13. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n13/mode/2up (вх. 21.04.20)
14. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2004%20of%204#page/n101/mode/2up (вх. 22.04.20).
15. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2004%20of%204#page/n267/mode/2up (вх. 22.04.20).
16. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2004%20of%204#page/n287/mode/2up (вх. 23.04.20).
17. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2004%20of%204#page/n293/mode/2up (вх. 23.04.20).
18. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2004%20of%204#page/n277/mode/2up (вх. 23.04.20).
19. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2004%20of%204#page/n313/mode/2up (вх. 24.04.20)).
20. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2004%20of%204#page/n315/mode/2up (вх. 23.04.20).
21. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n385/mode/1up (вх. 27.04.20).
22. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n401/mode/1up (вх. 27.04.20).
23. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n405/mode/1up (вх. 28.04.20).
24. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n406/mode/1up (вх. 28.04.20).
25. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n416/mode/1up (вх. 29.04.20).
26. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n417/mode/1up (вх. 29.04.20).
27. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n130/mode/1up (вх. 27.04.20).
28. https://archive.org/stream/GeorgeAbramovichKoval/George%20Abramovich%20Koval%20Part%2002%20of%204#page/n187/mode/1up (вх. 07.05.20).
База данных Ancestry.com Inc
1. «All Texas, Passenger Lists, 1893–1963 results for Abram Koval», https://search.ancestry.com/cgi-bin/sse.dll?db=gpl&gss=sfs28_ms_db&new=1&rank=1&msT=1&gsfn=Abram&gsfn_x=0&gsln=Koval&gsln_x=1&MSAV=1&uidh=000
2. «Hamburg Passenger Lists, 1850–1934 for Abram Kowal», https://www.ancestry.com/interactive/1068/K_1782_080541–0503?pid=1151720&treeid=&personid=&rc=&usePUB=true&_phsrc=DTU25&_phstart=successSource
3. «Iowa, County Marriages, 1838–1934», database,
4. «List or manifest of alien passengers applying for admission to the United States from foreign contiguous territory», https://www.ancestry.com/interactive/1075/m1464_50–0127?pid=141614&treeid=&personid=&rc=&usePUB=true&_phsrc=Zap54&_phstart=successSource
5. «for Ettel Schnitzky», https://www.ancestry.com/interactive/7488/NYT715_1678–0518?pid=4008525001&backurl=https://search.ancestry.com/cgi-bin/sse.dll?_phsrc%3DRQf2%26_phstart%3DsuccessSource%26usePUBJs%3Dtrue%26indiv%3D1%26db%3Dnypl%26gss%3Dangs-d%26new%3D1%26rank%3D1%26gsfn%3DEttel%26gsfn_x%3DNP%26gsln%3DSchnitzky%26gsln_x%3DNP%26MSAV%3D1%26uidh%3Dy31%26pcat%3D40%26fh%3D0 %26h%3D4008525001%26recoff%3D8%25209%26ml_rpos%3D1&treeid=&personid=&hintid=&usePUB=true&_phsrc=RQf2&_phstart=successSource&usePUBJs=true
6. «U.S., Border Crossings from Canada to U. S., 1895–1960»,https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=1075&h=58790&tid=&pid=&usePUB=true&_phsrc=DTU92&_phstart=successSource