@misc{Filipek_Marcin_The_1991,
 author={Filipek, Marcin},
 volume={47},
 number={6},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1991},
 publisher={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 language={pol},
 title={The heron, Ardea cinerea, is a breeding species in the Bieszczady Mts.},
 type={Text},
 URL={http://www.rcin.org.pl/Content/86424/PDF/KR038_102847_r1991-t47-no6_ChPO-Filipek-87-89.pdf},
 keywords={heron, Bieszczady Mountains (Poland) - animal species, Ardea cinerea},
}