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URL: http://books.google.com/books?id=NbkOAAAAQAAJ (Google Books. Digitalisiert: 10. Dez. 2007, Vorlage: Oxford Univ.) [ePub; G; PDF]
URL: http://books.google.com/books?id=3YMpAAAAYAAJ (Google Books. Digitalisiert: 11. Juli 2008, Vorlage: Harvard Univ.) [ePub; G; PDF]
URL: http://books.google.com/books?id=7D8YAAAAYAAJ (Google Books. Digitalisiert: 3. Apr. 2008, Vorlage: New York Public Library) [ePub; G; PDF]
URL: http://books.google.com/books?id=SmA-AAAAcAAJ (Google Books. Digitalisiert: 25. Sept. 2009, Vorlage: BSB München) [G; PDF]