关于旅游产业或灰色关联或产业结构优化的英文文献？

2009-2012年中国旅游业市场投资分析
With the social development, tourism has become a development trend in the global economy the strongest and one of the largest industries. Tourism in the city's economic development in the industry, the economy gradually increased, and the tourism industry to boost the urban economy, and the driving force of employment, as well as the promotion of culture and the role of the environment become more and more. Tourism is the economic development of China's pillar industries.
China's tourism industry in 2006 still maintained a rapid growth, overall growth in three major markets. Received a total of 124,942,100 million inbound tourists (of which the number of inbound travelers reached 49,913,400 passengers, up 6.6 percent), the realization of the international tourism income of 33.949 billion U.S. dollars of foreign exchange, respectively, an increase of 3.9% and 15.9%; domestic tourism number of 1,394,000,000 people, 623 billion yuan revenue