@misc{Klasa_Anna_The_1989,
 author={Klasa, Anna},
 volume={45},
 editor={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 number={4},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1989},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 type={Text},
 title={The beaver, Castor fiber, in the Ojców National Park},
 URL={http://rcin.org.pl/Content/68875/PDF/KR038_89033_r1989-t45-no4_ChPO-Klasa-64-74.pdf},
 keywords={beaver, Ojców National Park (Ojców, Poland), Castor fiber},
}