Singklieng S, Sikkhabandit S, Sriprasertpap K. Academic Management Strategies of English Program School Under Office of the Private Education Commission (OPEC): Bangkok District. RJPJ [internet]. 2022 Apr. 14 [cited 2026 Aug. 31];16(45):549-6. available from: https://so05.tci-thaijo.org/index.php/RJPJ/article/view/257279