@misc{Z._N._Z_1969,
 author={Z. N.},
 address={Poznań},
 year={1969},
 contents={Strona 258-259},
 publisher={Poznań : IZ,},
 language={pol},
 title={Z kroniki naukowej – 20-lecie Deutsches Wirtschaftsinstitut w Berlinie},
 type={text},
}