@misc{Beal_Foster_Ellenborough_Lascelles_Food,
 author={Beal, Foster Ellenborough Lascelles},
 howpublished={online},
 publisher={Government Printing Office},
 language={eng},
 type={monografie},
 title={Food of the bobolink, blackbirds, and grackles},
 keywords={zoologia, kręgowce, ptaki},
}