de Castro, J.P.R. and Martins, M.F.C.P.F. (2012) “NATURAL PROTECTED AREAS AND SUSTAINABLE TOURISM: MONTESINHO NATURAL PARK AND DOURO INTERNATIONAL NATURAL PARK”, Tourism & Management Studies, pp. 1152–1158. Available at: https://www.tmstudies.net/index.php/ectms/article/view/314 (Accessed: 28 April 2024).