Veltre, Thomas: Menagerie, metaphors and meanings. In: New Worlds, New Animals. From Menagerie to Zoological Park in the 19th Century. Hrsg. v. Robert Hoage/ W. Deiss. Baltimore 1996. Internet: https://books.google.de/books?id=15AsyQ8O2qoC&printsec=frontcover&dq=New+Worlds,+New+Animals.+From+Menagerie+to+Zoological+Park+in+the+19th+Century.&hl=en&sa=X&ved=0ahUKEwjhj9OD6L_VAhWKzRoKHQnGCjIQ6AEIJjAA#v=onepage&q&f=false. S. 19–29.