Shortened footnote and citation:
{{sfn|Birkhofer|1995|p=}}
* {{cite book | last=Birkhofer | first=Gerhard | title=Die perspektivische Darstellung. grundl: Grundlagen | publisher=ALS-Verl | publication-place=Dietzenbach | date=1995 | isbn=978-3-89135-048-5 | language=de}}
Named reference:
<ref name="x022">{{cite book | last=Birkhofer | first=Gerhard | title=Die perspektivische Darstellung. grundl: Grundlagen | publisher=ALS-Verl | publication-place=Dietzenbach | date=1995 | isbn=978-3-89135-048-5 | language=de | page=}}</ref>