1. General Office of the State Council. Guiding opinions on promoting the development of all-area tourism [EB/OL]. http:// www.gov.cn/zhengce/content/2018 -03/22/content_5276447. htm. 2019-06-16.
2. Nineteenth National Congress of the Communist Party of China. Report on the 19th National Congress of the Communist Party of China: "Winning the victory of building a moderately prosperous society and winning the great victory of socialism with Chinese characteristics in the new era".
3. Li Xinjian, Zhang Lingyun, Cui Li. Territorial tourism: a conceptual innovation for building a world-class tourist destination--Taking Beijing as an example [J]. Human Geography, 2013,28(03):130-134.
4. Zhang Hui. The core issue of all-area tourism is to realize the completeness of tourism in four "domains"[EB/OL]. http://www.xinhuanet.com/travel/2017-09/17/c_1121676914.htm,2017-09-17.
5. Zhu Juncheng. A study on the synergistic development of regional multi-centers based on symbiosis theory [J]. Economic Geography, 2010, 30 (08):1272-1277.