Shortened footnote and citation:
{{sfn|Clark|Barth|Clark|2008|p=}}

* {{cite book | last=Clark | first=Christopher M. | last2=Barth | first2=Richard | last3=Clark | first3=Christopher M. | title=Preußen: Aufstieg und Niedergang 1600 - 1947 | publisher=Dt. Verl.-Anst | publication-place=München | date=2008 | isbn=3-421-05392-8 | language=de}}


Named reference:
<ref name="h855">{{cite book | last=Clark | first=Christopher M. | last2=Barth | first2=Richard | last3=Clark | first3=Christopher M. | title=Preußen: Aufstieg und Niedergang 1600 - 1947 | publisher=Dt. Verl.-Anst | publication-place=München | date=2008 | isbn=3-421-05392-8 | language=de | page=}}</ref>