CHANGSAVANG, Viphachack, and Yang Chaojun. “Research on Satisfaction Evaluation and Factors of International Express Service in Laos”. Souphanouvong University Journal Multidisciplinary Research and Development 7, no. 1 (October 11, 2021): 198–205. Accessed January 17, 2026. http://www.su-journal.com/index.php/su/article/view/113.