The animal ethics reader. Hrsg. v. Susan J. Armstrong/ Richard George Botzler. 2nd ed. London ; New York 2008. Internet: https://books.google.de/books?id=4TwWJ8sds84C&printsec=frontcover&dq=The+Animal+Ethics+Reader&hl=en&sa=X&ved=0ahUKEwiZgITl6YfRAhWPMFAKHQXbCmUQ6AEIHDAA#v=onepage&q=The%20Animal%20Ethics%20Reader&f=false.