Wongsaphan, M. et al. 2026. Evaluation of a Contextual Problem-based Learning (CoPBL) Model Integrated with Ethno-SSI using a School Herbal Garden to Strengthen Students’ 21st-century Skills and Sustainable Living. Journal of Engineering Education Transformations. 40, 1 (Oct. 2026), 159–168. DOI:https://doi.org/10.16920/jeet/2026/v40is1/26160.