@misc{Kasprzak_Krzysztof_An_1977,
 author={Kasprzak, Krzysztof},
 volume={33},
 editor={Research Centre for the Protection of Nature of the Polish Academy of Sciences},
 number={1},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 address={Kraków},
 journal={Let's protect Our Indigenous Nature},
 howpublished={online},
 year={1977},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 type={Text},
 title={An appeal for the preservation of the nature reserves in the lower stretches of the Wełna river},
 URL={http://rcin.org.pl/Content/147992/PDF/KR038_182062_r1977-t33-no1_ChPO-Kasprzak-60-66.pdf},
}