@misc{Wijngaarden_A._The_1965,
 author={Wijngaarden, A.},
 volume={10},
 number={6},
 copyright={Prawa zastrzeżone - dostęp nieograniczony},
 journal={Acta Theriologica},
 address={Białowieża},
 howpublished={online},
 year={1965},
 language={eng ; rus ; pol},
 type={Tekst},
 title={The present status of the European beaver, Castor fiber Linnaeus, 1758 an investigation which was carried out at the instigation of the "International Union for the Conservation of Nature and Natural Resources (I.U.C.N.)"},
 URL={http://rcin.org.pl/Content/9366/PDF/BI002_2613_Cz-40-2_Acta-T10-nr6-93-96_o.pdf},
 keywords={Castor fiber},
}