Artur I, Duque da Bretanha (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Artur I, Duque da Bretanha" in Portuguese language version.

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McAuliffe, Mary (2012). Clash of Crowns: William the Conqueror, Richard Lionheart, and Eleanor of Aquitaine—A Story of Bloodshed, Betrayal, and Revenge (em inglês). Lanham: Rowman & Littlefield Publishers. p. 198. ISBN 9781442214736