@misc{Korwin_Florian._Autor_Letuwa_[około,
 author={Korwin, Florian. Autor},
 copyright={Public Domain},
 address={Wilno},
 howpublished={online},
 year={[około 1918]},
 publisher={nakładem matki autora},
 language={pol},
 type={Text},
 title={Letuwa},
 URL={http://rcin.org.pl./Content/239265/WA248_275591_F-4639_korwin-letuwa_o.pdf},
}