Shortened footnote and citation:
{{sfn|Martin|Kliegel|2008|p=}}

* {{cite book | last=Martin | first=Mike | last2=Kliegel | first2=Matthias | title=Psychologische Grundlagen der Gerontologie | publisher=W. Kohlhammer Verlag | publication-place=Stuttgart | date=2008 | isbn=978-3-17-020602-1 | language=de}}


Named reference:
<ref name="q640">{{cite book | last=Martin | first=Mike | last2=Kliegel | first2=Matthias | title=Psychologische Grundlagen der Gerontologie | publisher=W. Kohlhammer Verlag | publication-place=Stuttgart | date=2008 | isbn=978-3-17-020602-1 | language=de | page=}}</ref>