Animals and human society: changing perspectives. Hrsg. v. Aubrey Manning/ James Serpell. London ; New York 1994. Internet: https://books.google.de/books?id=GCiIAgAAQBAJ&printsec=frontcover&dq=Animals+and+Human+Society.+Changing+Perspectives.&hl=en&sa=X&ved=0ahUKEwiY95bq2rLTAhWQDRoKHfOYA2gQ6AEIIjAA#v=onepage&q&f=false.