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Sorabji, Richard: Animal minds and human morals: the origins of the Western debate. 1. print., Cornell paperbacks. Ithaca, N.Y 1995. Internet: https://books.google.de/books?id=lpb48Kaus4cC&printsec=frontcover&dq=Animal+Minds+and+Human+Morals.+The+Origins+of+the+Western+Debate&hl=de&sa=X&ved=0ahUKEwi5kdS6zfvSAhXFaxQKHe5bDcQQ6AEIHTAA#v=onepage&q=Animal%20Minds%20and%20Human%20Morals.%20The%20Origins%20of%20the%20Western%20Debate&f=false.
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