@techreport{Łopińska:2021,
author
=
"A.Łopińska and M.Ciepliński",
title
=
"Ecole feeder. Introduction to birdwatching, -",
institution
=
"University of Zielona Góra, Institute of Biological Sciences",
year
=
"2021",
note
=
"Supervisor: [Przewodnik do oznaczania gatunków ptaków]",
}