@misc{B._Miśkiewicz_Defence_1966,
 author={B. Miśkiewicz},
 address={Poznań},
 year={1966},
 contents={Strona 6},
 publisher={Poznań : IZ,},
 language={pol},
 title={Defence of the Polish Western Frontier during the Period of Early Feudalism in the Light of Previous Studies},
 type={text},
}