Shortened footnote and citation:
{{sfn | Gründer | 2007 | p=}}
* {{cite book | last=Gründer | first=Torsten | title=Managementhandbuch IT-Sicherheit | publisher=Erich Schmidt Verlag GmbH & Co KG | publication-place=Berlin | date=2007 | isbn=978-3-503-10002-6 | language=de}}
Named reference:
<ref name="e509">{{cite book | last=Gründer | first=Torsten | title=Managementhandbuch IT-Sicherheit | publisher=Erich Schmidt Verlag GmbH & Co KG | publication-place=Berlin | date=2007 | isbn=978-3-503-10002-6 | language=de | page=}}</ref>