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URL: http://books.google.com/books?id=XzApAAAAYAAJ (Google Books. Digitalisiert: 3. Juli 2008, Vorlage: Harvard University) [G; PDF]
URL: http://books.google.com/books?id=ANSGl4Y_nI0C (Google Books. Digitalisiert: 12. August 2005, Vorlage: Harvard University) [G; PDF]
URN: urn:nbn:de:bvb:12-bsb10250991-4 (BSB München) [G; PDF]
URN: urn:nbn:de:bvb:12-bsb10250992-0 (BSB München) [G; PDF]
URL: http://books.google.com/books?id=3og-AAAAcAAJ (Google Books. Digitalisiert: 5. Okt. 2009, Vorlage: BSB München) [G; PDF]
[DDC: 891.21]