Kiatmanaroch, T., and O. Puarattanaarunkorn. “Concordance Between the Volatility of Growth Rate of Chinese Tourist Arrivals to Thailand and Singapore”. WMS Journal of Management, Vol. 9, no. 3, July 2020, pp. 113-28, https://so06.tci-thaijo.org/index.php/wms/article/view/243630.