C. , S. Spalding, M. Jenkins, and M. D. , The World's Protected Areas. Status, values and prospects in the 21 st century " . Prepared by the UNEP World Conservation Monitoring Centre, 2008.

C. , H. C. Sirakaya, and E. , Sustainability indicators for managing community tourism, pp.1274-1289, 2006.

C. , C. Fletcher, J. Gilbert, D. , W. et al., Tourism principles and practice, 1993.

E. Proyecto, T. Entre, . Ambiental, and . Socio-cultural, P á g i n a | 46 | Rev. geogr. Valpso (En línea) Nº 48, pp.718-9877, 2013.

C. and R. Almatourism, The Sustainability between Society and Environment: the European Project " ERNEST " in the Province of Rimini, pp.96-108, 2012.

A. Savelli and . Turismo, Ricerche ed esperienze nell'area mediterranea, pp.285-306

D. , F. Gaddoni, S. En-caldo, C. Guarrasi, and V. , I portici a Bologna Oggetto di conservazione e simbolo d'identità urbana, Geografia e Beni culturali, pp.61-112, 1994.

A. Holden, Tourism and environment, 2008.

K. Das, D. Devadas, V. Najjamuddinc, and D. , Integrated Tourism Planning for Sustainable Development, Pakistan Journal of Applies Sciences, vol.3, issue.6, pp.440-454, 2003.

E. Proyecto, T. Entre, . Ambiental, and . Socio-cultural, P á g i n a | 47 | Rev. geogr. Valpso (En línea) Nº 48, pp.718-9877, 2013.

. Madrid, El turismo internacional mantendrá un crecimiento fuerte en 2013, OMT, 2013.