Leiter, Brian: Nietzsche on morality. London; New York 2015. Internet: https://books.google.de/books?id=YBDEBAAAQBAJ&printsec=frontcover&dq=Nietzsche+on+Morality.&hl=de&sa=X&ved=0ahUKEwjT1_OJxvvSAhVFaRQKHRmlCZAQ6AEIKzAC#v=onepage&q=Nietzsche%20on%20Morality.&f=false.