Shortened footnote and citation:
{{sfn | Kroll | 2006 | p=}}
* {{cite book | last=Kroll | first=Frank-Lothar | title=Preussens Herrscher | publisher=C.H.Beck | publication-place=München | date=2006 | isbn=3-406-54129-1 | oclc=612504591 | language=de}}
Named reference:
<ref name="e993">{{cite book | last=Kroll | first=Frank-Lothar | title=Preussens Herrscher | publisher=C.H.Beck | publication-place=München | date=2006 | isbn=3-406-54129-1 | oclc=612504591 | language=de | page=}}</ref>