@misc{Dyrcz_Andrzej_Ptaki_1973,
 author={Dyrcz, Andrzej},
 volume={R. 38},
 editor={Research Centre for the Protection of Nature of the Polish Academy of Sciences},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 address={Kraków},
 journal={Protection of Nature},
 howpublished={online},
 year={1973},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 type={Text},
 title={Ptaki polskiej części Karkonoszy},
 title={The birds of the Polish part of the Karkonosze Mountains},
 URL={http://www.rcin.org.pl/Content/145746/PDF/KR038_140713_r1973-r38_OP-Dyrcz-213-284.pdf},
 keywords={Karkonosze Mountains},
}