@misc{International_Biological_Programme._PT_Section._Working_Group_on_Granivorous_Birds_Productivity,_1973,
 author={International Biological Programme. PT Section. Working Group on Granivorous Birds and Kendeigh, S. Charles. Red and Pinowski, Jan (1930– ). Red},
 copyright={Rights Reserved - Restricted Access},
 address={Warszawa},
 howpublished={online},
 year={1973},
 publisher={PWN-Polish Scientific Publishers},
 language={eng},
 title={Productivity, population dynamics and systematics of granivorous birds},
 type={Text},
 keywords={sparrows, Passeriformes, passerine birds, Passer},
}