Thachomphu, Thanatporn. “The Relationships Between Positive Psychological Capital, Perceived Organizational Support, and Employee Engagement on the Organizational Citizenship Behaviors of Employees at a Private Company”. Ph.D. in Social Sciences Journal 11, no. 3 (December 31, 2021): 636–648. Accessed May 1, 2024. https://so05.tci-thaijo.org/index.php/phdssj/article/view/182251.