@misc{Klasa_Anna_A_1989,
 author={Klasa, Anna},
 volume={45},
 editor={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences},
 number={5-6},
 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={Institute of Nature Conservation Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={A new locality of the beavers, Castor fiber, in the Prądnik stream},
 URL={http://www.rcin.org.pl/Content/68090/PDF/KR038_87937_r1989-t45-no5-6_ChPO-Klasa-94-95.pdf},
}