SINGH, Jasmer. Mental Arithmetic Efficiency among Children with Visual Impaired and Sighted. Journal of Disability Management and Rehabilitation, [S.l.], p. 46-50, apr. 2018. ISSN 2454-6437. Available at: <http://jdmronline.org/index.php/jdmr/article/view/45>. Date accessed: 22 mar. 2019. doi: http://dx.doi.org/10.29120/JDMR.3.2.2018.46-50.