Histoire des Ducs de Normandie et des Rois d' Angleterre, ed. Francisque Michel (Paris 1840) "Extract E". translated on Dr Helen Nicholson's website. Archived from the original on 19 June 2014. Retrieved 2 December 2013.
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Histoire des Ducs de Normandie et des Rois d' Angleterre, ed. Francisque Michel (Paris 1840) "Extract E". translated on Dr Helen Nicholson's website. Archived from the original on 19 June 2014. Retrieved 2 December 2013.