Khruwatanakul P, Nusso T. Development of Learning Package on Part Making with Machine Tools 2 for Vocational Certificate Students. J.mul.res.soc.in [internet]. 2025 Dec. 24 [cited 2026 Sep. 18];1(3):27-38. available from: https://so10.tci-thaijo.org/index.php/MRSI/article/view/2937