Shortened footnote and citation:
{{sfn|Dreyhaupt|1994|p=}}

* {{cite book | last=Dreyhaupt | first=Franz Joseph | title=VDI-Lexikon Umwelttechnik | publisher=VDI-Verl | publication-place=Düsseldorf | date=1994 | isbn=3-18-400891-6 | language=de}}


Named reference:
<ref name="z495">{{cite book | last=Dreyhaupt | first=Franz Joseph | title=VDI-Lexikon Umwelttechnik | publisher=VDI-Verl | publication-place=Düsseldorf | date=1994 | isbn=3-18-400891-6 | language=de | page=}}</ref>