Karen S. Nicholas: 4. Countesses as Rulers in Flanders =. In: Aristocratic Women in Medieval France. University of Pennsylvania Press, Philadelphia 1999, ISBN 978-0-8122-0061-4, S.117, doi:10.9783/9780812200614.111.
Karen S. Nicholas: 4. Countesses as Rulers in Flanders. In: Aristocratic Women in Medieval France. University of Pennsylvania Press, Philadelphia 1999, ISBN 978-0-8122-0061-4, S.113, doi:10.9783/9780812200614.111.
