Lavalesh Pratap Singh, and Adya Shakti Rai. “Visually Challenged Students’ Proficiency in the Use of Abacus”. JOURNAL OF INDIAN EDUCATION, vol. 40, no. 2, Dec. 2024, pp. p.91-98, http://45.127.197.188:8090/index.php/jie/article/view/1656.