Jadwiga Andegaweńska i kszałtowanie się Europy ŚrodkowowschodniejOskar Jadwiga · First published 2000Open the Tome
The Chicago council on foreign relations presents Poland and RussiaOskar Jadwiga, Chicago Council on Foreign Relations · First published 1944Open the Tome
Z Jana Zamoyskiego inwentarza archiwum koronnegoZamoyski, Jan, Oskar Jadwiga · First published 1917Open the Tome
