คำภักดี ส. “The Effect of Activities Base on Contemplative Education on Serenity of New Staffs in Khon Kaen Rajanakarindra Psychiatric Hospital”. Journal of Education Khon Kaen University (Graduate Studies Research), vol. 11, no. 4, May 2018, pp. 205-16, https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/125576.