Kunthonluxamee, A., S. Pitimana-aree, and P. Laurujisawat. “Validity and Reliability of the Amsterdam Preoperative Anxiety and Information Scale (APAIS); Thai Version in Adult Thai Pre-Operative Patients”. Journal of the Psychiatric Association of Thailand, vol. 54, no. 1, Mar. 2013, pp. 83-92, https://he01.tci-thaijo.org/index.php/JPAT/article/view/7528.