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The Gesta Normannorum Ducum of William of Jumieges, Orderic Vitalis, and Robert ...
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The Gesta Normannorum Ducum of William of Jumieges, Orderic Vitalis, and Robert of Torigni, Vol. II, Books V-VIII, ed. Elisabeth M.C. Van Houts (Clarendon Press, Oxford, 1995), pp. 40–1. Cited by Wikipedia. Robert I, Duke of Normandy. https://en.wikipedia.org/wiki/Robert_I%2C_Duke_of_Normandy. Accessed May 5, 2017.