Laroatphotawatana, Pardit, and Samruay Warapin. “Electronic Book (E - Book) Subject : Strength of Materials (30100 - 0105) for Vocational Certificate Level Students in the Automotive Department”. Vocational Education Central Region Journal 7, no. 2 (December 28, 2023): 104–112. accessed January 8, 2026. https://so06.tci-thaijo.org/index.php/IVECJournal/article/view/269155.