@misc{Tworek_Stanisław_Jak_2007,
 author={Tworek, Stanisław},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 howpublished={online},
 year={2007},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 title={Jak efektywnie chronić ptaki i ich siedliska?},
 type={Text},
 URL={http://www.rcin.org.pl/Content/79407/PDF/KR038_98051_r2007_IntegOP-Tworek-109-116.pdf},
 keywords={birds - protection, bird habitats - protection},
}