Parksin K, Charoenkitthanalap S. Application of Lean Production to Sale and Customer Relations Center Development of TOT Public Company Limited, Phra Nakhon Si Ayutthaya Province. jma [internet]. 2022 Aug. 28 [cited 2026 Aug. 28];9(2):232-45. available from: https://so04.tci-thaijo.org/index.php/JMA/article/view/258371