David C. Douglas, William the Conqueror (University of California Press, Berkele...

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David C. Douglas, William the Conqueror (University of California Press, Berkeley and Los Angeles, 1964), p. 32. Cited by Wikipedia. Robert I, Duke of Normandy. https://en.wikipedia.org/wiki/Robert_I%2C_Duke_of_Normandy. Accessed May 5, 2017.

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