1. Heidegger, Martin, Introducción a la metafísica (alemán: Einführung in die Metaphysik), es un libro escrito publicado en Alemania en 1953 de un ciclo de conferencias revisado y editado en el verano de 1935 en la Universidad de Friburgo.
2. Encyclopædia Britannica, Inc.;World Heritage site,2020
3. The world heritage – a vision for the future;Train,2002
4. United Nations Educational, Scientific and Cultural Organization (UNESCO), it is a UN body that was founded in 1945, with its headquarters in Paris (France).
5. Scientific and Cultural Organization (UNESCO), Convention concerning the protection of the world cultural and natural heritage;United Nations Educational,1972