ดาวเรือง ศ. Application of cause and effect charts to find the cause of service problems of Siam Technique . RSSKRU.J [Internet]. 2020 Oct. 16 [cited 2024 May 17];6(1):22-38. Available from: https://so01.tci-thaijo.org/index.php/sskru-resarch/article/view/243581