Kaosanga , khatthanam, Palan Jantarajaturapath, and Anirut Pongklee. “Effects of Proactive Customer Service on Operational Efficiency of Hotel Businesses in Lao PDR”. Journal of Accountancy and Management 9, no. 1 (March 30, 2018): 156–165. Accessed April 20, 2024. https://so02.tci-thaijo.org/index.php/mbs/article/view/240725.