Douro Valley Tourism Plan: The Plan as a Part of a Sustainable Tourist Destination Development Process N. Fazenda F. N. Silva C. M. M. Costa Publication Journal: Worldwide Hospitality and Tourism Themes Year of Publication: 2010 Volume: 2 Issue: 4 Pagination: 428--440 Identifiers Other Numbers: 25561807 Alternative titles DOIGoogle ScholarBibTeXRIS Locators