@misc{Witkowski_Zbigniew_Ten_1969,
 author={Witkowski, Zbigniew},
 volume={25 nowa seria},
 number={2},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Let's protect Our Indigenous Nature},
 address={Kraków},
 howpublished={online},
 year={1969},
 publisher={Polish Academy of Sciences},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 title={Ten years of the RIVON in the Netherlands},
 type={Text},
 URL={http://www.rcin.org.pl/Content/70694/PDF/KR038_91052_r1969-t25-no2_ChPO-Witkowski-70-72.pdf},
 keywords={Netherlands, RIVON},
}