Sukmanomon, Sarawut, Tawan Vigaiyapat, Pichai Latthasaksiri, and Thanakit Yamphuen. 2023. “ LTD”. Journal of MCU Phetchaburi Review 6 (1):หน้า 34 - 46. https://so03.tci-thaijo.org/index.php/JPR/article/view/264960.