อยู่เย็น วิภาวรรณ. 2020. “Prince Wongsathiratsanit : the Scholar Who Solved the Problem of the Confusing Used of Marks < ๗ > and < ๘ > In the Thai Writing System”. Journal of the Faculty of Arts, Silpakorn University 30 (2):9-24. https://so04.tci-thaijo.org/index.php/jasu/article/view/239912.