Phainrungruang, R., & Lueboonthavatchai, P. (2014). Interpersonal Problems and Depression of the Elderly at the Elderly Association in Phitsanulok Province. Journal of the Psychiatric Association of Thailand, 60(1), 23–34. Retrieved from https://he01.tci-thaijo.org/index.php/JPAT/article/view/33406