37.		Capacité de charge et production touristique / J. M. Thurot Autor: Thurot, J. M. Data Publicação: 1980
38.		Environmental protection through tourism / Colin Clark Autor: Clark, Colin
39.		Guia informativo do ambiente / Direcção-Geral do Ambiente, Ministério do Ambiente e Recursos Naturais Data Publicação: 1995? Col.autor: Portugal. Ministério do Ambiente e Recursos Naturais. Direcção-Geral do Ambiente
40.		The construction of sectoral environmental pressure indicators: the case of tourism / Mara Camarrota, Carmine Pappalardo Autor: Cammarrota, Mara Coautor: ; Pappalardo, Carmine
41.		Concept for a national report on tourism, environment and nature protection in Germany / Andrea Mõller Autor: Mõller, Andrea
42.		Ecotourism: an economic analysis / Paul Steele Autor: Steele, Paul
43.		Resident perception of the environmental impacts of tourism / Juanita C. Liu, Pauline J. Sheldon, Turgut Var Autor: Liu, Juanita C. Coautor: ; Sheldon, Pauline J. Var, Turgut
44.		Environmental impacts of recreational home developments / William C. Gartner Autor: Gartner, William C
45.		WTO-ETAG joint seminar on tourism and environmental protection, Heidelberg (Alemanha), 16-18 May 1996 / World Tourism Organization; European Tourism Action Group Data Publicação: 1996 Col.autor: WTO-ETAG joint seminar on tourism and environmental protection. 1996
46.		Tourism and the environment: the innovation connection / Anne-Mette Hjalager Autor: Hjalager, Anne-Mette
47.		Le tourisme international à l'horizon 2000: quantité ou qualité? / Pierre Gouirand Autor: Gouirand, Pierre
48.		Impacto ambiental: ferramentas básicas / Mª Fátima Gomes Cardoso e Coelho Autor: Coelho, Maria Fátima Gomes Cardoso e