แสงเพชร พ. The Guidelines of Self Improvement for Employees to be Professionals and Create Competitive Adventage of Electrical Indiusty in Rayong Province. J.IBA [internet]. 2019 Dec. 26 [cited 2025 Dec. 10];1(2):69-81. available from: https://so03.tci-thaijo.org/index.php/iba/article/view/232158