Aljawfi, A., Hassanen , R. and Sharkawy , S. 2023. Effectiveness of training program by blended learning on knowledge and practices regarding first aid among preparatory year engineering students at Assiut University: 10.55131/jphd/2023/210221. Journal of Public Health and Development. 21, 2 (May 2023), 255–270. DOI:https://doi.org/10.55131/jphd/2023/210221.