sources:
- A. Buko, The Archaeology of Early Medieval Poland: Discoveries, Hypotheses, Interpretations (East Central and Eastern Europe in the Middle Ages, 450-1450) - https://books.google.pl/books?id=tAGwCQAAQBAJ&pg=PA144&lpg=PA144&dq=przemy%C5%9Bl+tatars+hill&source=bl&ots=Wvdn-o34Gt&sig=TLKz96tNAx_xqqRolJ9m6bIj4iI&hl=pl&sa=X&ei=p1htVdExxM_KA9WpgdgF&ved=0CEUQ6AEwBg