Shortened footnote and citation:
{{sfn | Korczak | 2023 | p=}}
* {{cite book | last=Korczak | first=Janusz | title=Themen seines Lebens - | publisher=Gütersloher Verlagshaus | publication-place=Gütersloh | date=2023-03-29 | isbn=978-3-579-06540-3 | language=de}}
Named reference:
<ref name="z211">{{cite book | last=Korczak | first=Janusz | title=Themen seines Lebens - | publisher=Gütersloher Verlagshaus | publication-place=Gütersloh | date=2023-03-29 | isbn=978-3-579-06540-3 | language=de | page=}}</ref>