Ketkeaw, W., R. Saipanish, T. Hiranyatheb, S. Jullagate, R. Prasertchai, and M. Lotrakul. “Co-Morbid Psychiatric Disorders in Patients With Obsessive-Compulsive Disorder”. Journal of the Psychiatric Association of Thailand, vol. 60, no. 1, Aug. 2014, pp. 3-12, https://he01.tci-thaijo.org/index.php/JPAT/article/view/33402.