Uthairat พิชญะ. “The Revenue Code and Sub-Ordinance Amendment for Personal Income Tax Voluntary Compliance in Thailand”. Journal of Management Science Nakhon Pathom Rajabhat University 2, no. 1 (October 12, 2018): 1–14. Accessed January 29, 2022. https://so03.tci-thaijo.org/index.php/JMSNPRU/article/view/150300.