Shortened footnote and citation:
{{sfn | Röper | Reyher | 1973 | p=}}
* {{cite book | last=Röper | first=Burkhardt | last2=Reyher | first2=Lutz | title=Gibt es geplanten Verschleiss? | publisher=Schwartz | publication-place=Göttingen | date=1973 | isbn=3-509-00953-3 | language=de}}
Named reference:
<ref name="n664">{{cite book | last=Röper | first=Burkhardt | last2=Reyher | first2=Lutz | title=Gibt es geplanten Verschleiss? | publisher=Schwartz | publication-place=Göttingen | date=1973 | isbn=3-509-00953-3 | language=de | page=}}</ref>