@misc{Piskorski_Michał_Distributions,_1999,
 author={Piskorski, Michał},
 volume={55},
 number={2},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1999},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={Distributions, numbers and conservation of the bittern Botaurus stellaris in the Łęczyca-Włodawa Lakeland (E Poland)},
 URL={http://rcin.org.pl/Content/113231/PDF/KR038_109852_r1999-t55-no2_ChPO-Piskorski-52-64.pdf},
 keywords={bittern, Botaurus stellaris, Ardeidae, Pojezierze Łęczyńsko-Włodawskie},
}