Shortened footnote and citation:
{{sfn|Wielen|1988|p=}}

* {{cite book | last=Wielen | first=Roland | title=Planeten und ihre Monde | publisher=Spektrum d. Wissenschaft | publication-place=Heidelberg | date=1988 | isbn=3-922508-46-4 | language=de}}


Named reference:
<ref name="k186">{{cite book | last=Wielen | first=Roland | title=Planeten und ihre Monde | publisher=Spektrum d. Wissenschaft | publication-place=Heidelberg | date=1988 | isbn=3-922508-46-4 | language=de | page=}}</ref>