Which is the best book on the causes of the first world war?

http://www.theguardian.com/lifeandstyle/2014/jan/08/best-book-causes-first-world-war

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Following Michael Gove's political sniping, I'd like to know how accurate those "Blackadder myths" are. Which is the best book to read on the origins of the first world war?

<em>Nick Hunter, Sheffield</em>

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