@misc{Czeczuga_Bazyli_The_1969,
 author={Czeczuga, Bazyli},
 volume={25 nowa seria},
 number={5},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1969},
 publisher={Polish Academy of Sciences},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 title={The need for safeguarding the Biebrza river valley},
 type={Text},
 URL={http://www.rcin.org.pl/Content/197085/PDF/KR038_185129_r1969-t25-no5_ChPO-Czeczuga-27.pdf},
 keywords={Biebrza},
}