Warren, W. L. (1973). Henry II. Berkeley and Los Angeles, Calif.: University of California Press. s. 281-283. ISBN0-520-02282-3. OCLC724021. Hentet 13. august 2011.
Warren, W. L. (1973). Henry II. Berkeley and Los Angeles, Calif.: University of California Press. s. 281-283. ISBN0-520-02282-3. OCLC724021. Hentet 13. august 2011.