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* Zeender, John K. "Recent Literature on the German Center Party," ''Catholic Historical Review'', Vol. 70, No. 3 (Jul., 1984), pp. 428-441 [http://www.jstor.org/stable/25021868 in JSTOR]
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* Zeender, John K. "Recent Literature on the German Center Party," ''Catholic Historical Review'', Vol. 70, No. 3 (Jul., 1984), pp. 428–441 [http://www.jstor.org/stable/25021868 in JSTOR]