Wangwon, Chatwut, and Saran Pimthong. 2023. “Effectiveness of Positive Psychological Capital Program on Work Engagement of Employees of Non-Governmental Organizations (NGOs) on Gender Diversity”. Journal of Behavioral Science for Development 15 (1):108-24. https://so02.tci-thaijo.org/index.php/JBSD/article/view/259180.