* {{cite book | last=Poster | first=Carol | last2=Utz | first2=Richard J. | title=Constructions of Time in the Late Middle Ages | publisher=Northwestern University Press | publication-place=Evanston, Ill | date=1997 | isbn=0-8101-1541-7 | language=de}}
<ref name="y985">{{cite book | last=Poster | first=Carol | last2=Utz | first2=Richard J. | title=Constructions of Time in the Late Middle Ages | publisher=Northwestern University Press | publication-place=Evanston, Ill | date=1997 | isbn=0-8101-1541-7 | language=de | page=}}</ref>