ສີສຸມັງ ປອ ນາງ ບຸນຖົມ, et al. “Taxation Income Efficiency to National Budget at Champasak Province, Preparing Joint the AEC, Case Study: Champasak Province, Lao PDR ”. Champasack University Scientific Journal, vol. 4, no. 4, July 2020, pp. 86-95, http://cu-journal.com/index.php/files/article/view/34.