Lin Zhu, Yuqing Geng, and Heshun Zhang. “The Appraisal and Countermeasure Analysis of the International Competitiveness of Tourism Service Trade in Henan Province”. Global Journal of Management and Business Research 21, no. F1 (January 15, 2021): 45–47. Accessed May 3, 2024. https://journalofbusiness.org/index.php/GJMBR/article/view/3488.