Shortened footnote and citation:
{{sfn | Kollinger | 2014 | p=}}
* {{cite book | last=Kollinger | first=Karol | title=Polityka wschodnia Bolesława Chrobrego (992-1025) =: The Eastern Policy of Bolesław Chrobry 992-1025 | publisher=Wydawnictwo Chronicon | publication-place=Wrocław | date=2014 | isbn=978-83-938172-6-9 | language=pl}}
Named reference:
<ref name="g229">{{cite book | last=Kollinger | first=Karol | title=Polityka wschodnia Bolesława Chrobrego (992-1025) =: The Eastern Policy of Bolesław Chrobry 992-1025 | publisher=Wydawnictwo Chronicon | publication-place=Wrocław | date=2014 | isbn=978-83-938172-6-9 | language=pl | page=}}</ref>