มณีรัตน์ ณ, ทัดแก้ว ช. The Importance of Numeral Systems in Trinisinghe. J. Lett. [internet]. 2019 Jun. 29 [cited 2025 Dec. 6];48(1):144-61. available from: https://so03.tci-thaijo.org/index.php/jletters/article/view/199607