@misc{_The,
 address={Buffalo},
 howpublished={online},
 publisher={[s.n.]},
 language={eng},
 type={druk},
 title={The Nicolaus Copernicus 500th Anniversary : program : February 2 – March 2 1973},
 keywords={Kopernik, Mikołaj (1473-1543), rocznica urodzin Kopernika, rocznice},
}