* {{cite book | last=Wippermann | first=Wolfgang | title=Das Leben in Frankfurt zur NS-Zeit | publisher=W. Kramer | publication-place=Frankfurt am Main | date=1986 | isbn=3-7829-0314-5 | language=de}}
<ref name="r654">{{cite book | last=Wippermann | first=Wolfgang | title=Das Leben in Frankfurt zur NS-Zeit | publisher=W. Kramer | publication-place=Frankfurt am Main | date=1986 | isbn=3-7829-0314-5 | language=de | page=}}</ref>