1.		Code of ethics on the international trade in chemicals / United Nations Environment Programme Data Publicação: 1994 Col.autor: United Nations Environment Programme COTA(S): 8568
2.		Climate change and tourism - responding to global challenges / World Tourism Organization, United Nations Environment Programme Col.autor: OMT Co col. autor: United Nations Environment Programme COTA(S): 12136; 12136-Dg
3.		Integrating sustainability into business : an implementation guide for responsible tourism coordinators / Xavier Font, Janet Cochrane Autor: Font, Xavier Coautor: ; Cochrane, Janet Co col. autor sec.: United Nations Environment Programme COTA(S): 11920
4.		Integrating sustainability into business : a management guide for responsible tour operations / Xavier Font, Janet Cochrane; United Nations Environment Programme Autor: Font, Xavier Coautor: ; Cochrane, Janet Co col. autor sec.: United Nations Environment Programme COTA(S): 11919
5.		Sustainable Coastal Tourism : An Integrated planning and management approach / United Nations Environment Programme Col.autor: United Nations Environment Programme COTA(S): 13714; 13714-Dg
6.		Making tourism more sustainable : A guide for policy makers / United Nations Environment Programme, World Tourism Organization Data Publicação: 2005 Col.autor: United Nations Environment Programme World Tourism Organization COTA(S): 15659; 15659-Dg
7.		Tour Guiding Research : Insights, Issues and Implications / Weiler, Betty Autor: Weiler, Betty; Black, Rosemary Co col. autor sec.: ; United Nations Environment Programme COTA(S): 16742