@misc{Kazimierz_Piwarski_The_1957,
 author={Kazimierz Piwarski},
 address={Poznań},
 year={1957},
 contents={Strona 8-11},
 publisher={Poznań : IZ,},
 language={pol},
 title={The Changes in the International Situation in the Last Forty Years (1917—1967)},
 type={text},
}