@book{Jerzak:2005,
author
=
"L.Jerzak and B.Kavanagh and P.Tryjanowski",
title
=
"Ptaki krukowate Polski, ISBN: 8389290928",
publisher
=
"Bogucki Wydaw. Naukowe",
address
=
"Poznań",
pages
=
"679",
year
=
"2005",
}