Bowie, K. A. “Eunuchs in Siam: Before, During and After the Reign of King Narai in Ayutthaya”. The Journal of the Siam Society, vol. 110, no. 1, May 2022, pp. 1-20, https://so06.tci-thaijo.org/index.php/pub_jss/article/view/256322.