Shortened footnote and citation:
{{sfn|Lenzen|2020|p=}}

* {{cite book | last=Lenzen | first=Manuela | title=Künstliche Intelligenz | publisher=C.H. Beck | publication-place=München | date=2020-03-16 | isbn=978-3-406-75124-0 | language=de}}


Named reference:
<ref name="w721">{{cite book | last=Lenzen | first=Manuela | title=Künstliche Intelligenz | publisher=C.H. Beck | publication-place=München | date=2020-03-16 | isbn=978-3-406-75124-0 | language=de | page=}}</ref>