@misc{Cienkowski_Leon_(1822–1887)_Listy,
 author={Cienkowski, Leon (1822–1887)},
 copyright={Public Domain},
 howpublished={online},
 language={pol},
 title={Listy Leona Cienkowskiego do Jerzego Aleksandrowicza},
 type={Image},
 URL={http://rcin.org.pl/miiz/Content/234556/WA058_271750_Cienkowski_2728m.pdf},
 keywords={Aleksandrowicz, Jerzy (1819-1894), correspondence - 19 c., biologists - Poland - biography},
}