CHUTIKAMO, Y. จดหมายหลวงอุดมสมบัติ. Suan Dusit Graduate School Academic Journal, Bankok, Thailand, v. 17, n. 1, p. 269–271, 2021. Disponível em: https://so19.tci-thaijo.org/index.php/SDUGSAJ/article/view/439. Acesso em: 2 jun. 2025.