Guo, Yanling, and Montira Rato. “The Development of Tea Planting and Tea Culture Tourism in Thai Nguyen, Vietnam”. Journal of Mekong Societies 15, no. 3 (December 28, 2019): 121-136. Accessed February 25, 2020. https://so03.tci-thaijo.org/index.php/mekongjournal/article/view/224840.