Ducado da Normandia (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ducado da Normandia" in Portuguese language version.

refsWebsite

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2books.google.com

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books.google.com

Hill, Paul (2015). The Norman Commanders: Masters of Warfare, 911–1135 (em inglês). Barnsley: Pen and Sword. p. 69. ISBN 9781473862807
North, William (2010). The Haskins Society Journal 21: 2009. Studies in Medieval History (em inglês). Woodbridge: Boydell & Brewer. p. 87. ISBN 9781843835608