Shortened footnote and citation:
{{sfn|Friedrich|2018|p=}}
* {{cite book | last=Friedrich | first=Volker | title=Technik denken | publisher=Franz Steiner Verlag | publication-place=Stuttgart | date=2018 | isbn=978-3-515-12042-5 | oclc=on1047931414 | language=de}}
Named reference:
<ref name="o521">{{cite book | last=Friedrich | first=Volker | title=Technik denken | publisher=Franz Steiner Verlag | publication-place=Stuttgart | date=2018 | isbn=978-3-515-12042-5 | oclc=on1047931414 | language=de | page=}}</ref>