Shortened footnote and citation:
{{sfn | Ehrhardt | Kroll | 2012 | p=}}
* {{cite book | last=Ehrhardt | first=Hendrik | last2=Kroll | first2=Thomas | title=Energie in der modernen Gesellschaft | publisher=Vandenhoeck & Ruprecht | publication-place=Göttingen | date=2012-05-23 | isbn=978-3-525-30030-5 | language=de}}
Named reference:
<ref name="q543">{{cite book | last=Ehrhardt | first=Hendrik | last2=Kroll | first2=Thomas | title=Energie in der modernen Gesellschaft | publisher=Vandenhoeck & Ruprecht | publication-place=Göttingen | date=2012-05-23 | isbn=978-3-525-30030-5 | language=de | page=}}</ref>