@misc{Czechowski_Paweł_Nesting,
 author={Czechowski, Paweł},
 howpublished={online},
 publisher={Zielona Góra: University of Zielona Góra, Faculty of Biological Sciences},
 language={eng},
 type={artykuł},
 title={Nesting of tree sparrow "Passer montanus" in the nest of barn swallow "Hirundo rustica"},
 keywords={wróblowe, jaskółkowate, ornitologia, Polska},
}