Hlawitschka, ‘Zur Herkunft,’ pp. 191ff; Creber, Alison (2019-04-22). “Breaking Up Is Hard To Do: Dissolving Royal and Noble Marriages in Eleventh-Century Germany” (英語). German History37 (2): 149–171. doi:10.1093/gerhis/ghy108. ISSN0266-3554.
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Hlawitschka, ‘Zur Herkunft,’ pp. 191ff; Creber, Alison (2019-04-22). “Breaking Up Is Hard To Do: Dissolving Royal and Noble Marriages in Eleventh-Century Germany” (英語). German History37 (2): 149–171. doi:10.1093/gerhis/ghy108. ISSN0266-3554.