@misc{_Nicolaus,
 address={Bethlehem, Pennsylvania},
 howpublished={online},
 publisher={Lehigh University},
 language={eng},
 type={katalog wystawy},
 title={Nicolaus Copernicus, 1473-1973 : his revolutions and his revolution : catalogue of an exhibition of manuscripts and books in the Linderman Library, Lehigh University, Bethlehem, Pennsylvania : September-November 1973},
}