อิ่มทอง น. Development of internal audit and internal control in unit under the Office of Public Health Samut Sakhon province Focus on effectiveness. HuaHin Med. J [internet]. 2019 Feb. 28 [cited 2026 Oct. 3];3(1):19-35. available from: https://he01.tci-thaijo.org/index.php/hhsk/article/view/175182