@misc{Piórecki_Jerzy_Trapa_2014,
 author={Piórecki, Jerzy},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 howpublished={online},
 year={2014},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={Trapa natans L. Kotewka orzech wodny},
 URL={http://rcin.org.pl/Content/129055/PDF/KR038_150713_r2014_PCzKR-Piorecki-343-345.pdf},
 keywords={red data book, flowering plants, Anthophyta, Trapa natans},
}