Sai-ubol P, Boonwises S. Work Morale of Officers in Immigration Division 1 during COVID-19 Pandemic. rpujournal [internet]. 2022 Aug. 25 [cited 2026 Sep. 17];8(2):249-64. available from: https://so03.tci-thaijo.org/index.php/rpu/article/view/262985