Shortened footnote and citation:
{{sfn | Rehm | Letzel | 2009 | p=}}

* {{cite book | last=Rehm | first=Hubert | last2=Letzel | first2=Thomas | title=Der Experimentator: Proteinbiochemie/Proteomics | publisher=Spektrum Akademischer Verlag | publication-place=Heidelberg | date=2009-11-19 | isbn=978-3-8274-2312-2 | language=de}}


Named reference:
<ref name="g491">{{cite book | last=Rehm | first=Hubert | last2=Letzel | first2=Thomas | title=Der Experimentator: Proteinbiochemie/Proteomics | publisher=Spektrum Akademischer Verlag | publication-place=Heidelberg | date=2009-11-19 | isbn=978-3-8274-2312-2 | language=de | page=}}</ref>