^Cerver, Francisco Asensio; Oussedik, Sylvia; Huet, Bernard (1995).
Elements of landscape. Arco Editorial Board. pp. 89–92.
ISBN978-84-8185-002-4. Retrieved 2 December 2011.
^Cerver, Francisco Asensio; Oussedik, Sylvia; Huet, Bernard (1995).
Elements of landscape. Arco Editorial Board. pp. 89–92.
ISBN978-84-8185-002-4. Retrieved 2 December 2011.