Kitbunyonglers, S. .-., and wongchan pachpichain. “Pain Assessment and Pain Management in Comatose Patients After Craniotomy: A Case Study”. The Journal of Thailand Nursing and Midwifery Council, vol. 33, no. 3, Sept. 2018, pp. 20-35, https://he02.tci-thaijo.org/index.php/TJONC/article/view/123019.