機構名稱 網址
World Tourism Organization (WTO) http://www.world-tourism.org/
World Travel & Tourism Council http://www.wttc.org/
National Park Service http://www.nps.gov/
International Association of Convention http://www.destinationmarketing.org/
& Visitor Bureaus
The American Society of Travel Agents http://astanet.com/
The EnviroLink Network http://www.envirolink.org/
International Union for Conservation http://www.iucn.org/
of Nature and Natural Resources(IUCN)