@misc{Bielawski_Ryszard_Badania_[ca,
 author={Bielawski, Ryszard},
 copyright={Creative Commons Attribution BY-NC 3.0 PL license},
 howpublished={online},
 year={[ca 1955]},
 title={Badania terenowe cz.2},
 type={Image},
 URL={http://www.rcin.org.pl/Content/208083/PDF/WA058_188966_Bielawski_Badania-terenowe.pdf},
 keywords={Zoological Institute of the Polish Academy of Sciences, field research},
}