El- Gohary, Hala Khairy Abdel- Ghany. 2021. “The Effectiveness of a Digital Learning Environment in Developing the Mathematical Achievement of Students With Hearing Impairment During the Period of Education Disorder (COVID- 19)”. Journal of Educational and Psychological Sciences 5 (19): 94-72. https://doi.org/10.26389/AJSRP.J291120.