@misc{Luniak_Maciej_(1936–_)_Ptaki_1971,
 author={Luniak, Maciej (1936– )},
 volume={13},
 editor={Polska Akademia Nauk. Instytut Zoologiczny},
 number={2},
 copyright={Rights Reserved - Free Access},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1971},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 language={rus},
 language={eng},
 type={Text},
 title={Ptaki środkowego biegu Wisły},
 URL={http://www.rcin.org.pl/Content/15504/PDF/WA058_31893_P257-T13_Acta-Ornith-Nr-2.pdf},
 keywords={birds, Poland, Vistula River, middle, Aves},
}