| Poschinger, Heinrich, Conversations with Prince Bismarck, Kessinger Publishing, 2007, 304 p | Bismarck and the German Empire |
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| Craig, Germany, 1866—1945 1978 , pp | Bismarck and the Development of Germany |
Emil Ludwig, Wilhelm Hohenzollern: The last of the Kaisers, New York 1927• information about Roman Catholic priesthood and religious life with directory of men's religious communities and diocesan links.
13| George Thomas; Lamport, Mark A | includes current and historical demographics for priests• |
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| Cowen, Rob 31 January 2012 |