Shortened footnote and citation:
{{sfn | Knapp | Krell | 2004 | p=}}
* {{cite book | last=Knapp | first=Manfred | last2=Krell | first2=Gert | title=Einführung in die internationale Politik | publisher=De Gruyter Oldenbourg | publication-place=München | date=2004 | isbn=3-486-25968-7 | language=de}}
Named reference:
<ref name="u528">{{cite book | last=Knapp | first=Manfred | last2=Krell | first2=Gert | title=Einführung in die internationale Politik | publisher=De Gruyter Oldenbourg | publication-place=München | date=2004 | isbn=3-486-25968-7 | language=de | page=}}</ref>