PESSOA, A. Tourism and Regional Competitiveness: the Case of the Portuguese Douro Valley. RPER, [S. l.], n. 18, p. 55–75, 2008. DOI: 10.59072/rper.vi18.259. Disponível em: http://review-rper.com/index.php/rper/article/view/259. Acesso em: 10 mai. 2026.