Shortened footnote and citation:
{{sfn|Unbehauen|2005|p=}}

* {{cite book | last=Unbehauen | first=Heinz | title=Regelungstechnik | publisher=Springer Science & Business Media | publication-place=Braunschweig | date=2005 | isbn=978-3-528-21332-9 | language=de}}


Named reference:
<ref name="k336">{{cite book | last=Unbehauen | first=Heinz | title=Regelungstechnik | publisher=Springer Science & Business Media | publication-place=Braunschweig | date=2005 | isbn=978-3-528-21332-9 | language=de | page=}}</ref>