Punya, S. “A Study of the Related Between Four Sublime States of Mind and Spiritual Well-Being of Chulamani Vocational College in Srisaket Province”. Journal of MCU Humanities Review, vol. 5, no. 2, Jan. 2020, pp. 47-60, https://so03.tci-thaijo.org/index.php/human/article/view/225870.