Costa, Vânia, Cláudia Almeida, and Oscarina Conceição. “Air Transport and Tourism Destinations: The Case of Oporto Airport and Portugal’s Northern Region”. Journal of Tourism & Development 2, no. 27/28 (January 1, 2017): 209-213. Accessed May 17, 2024. https://proa.ua.pt/index.php/rtd/article/view/20747.