Khanna, S., S. Bala, Y. Singh, T. Sharma, J. Kalra, D. C. Dhasmana, and S. Kohli. “Comparative Evaluation of Levetiracetam and Valproic Acid As Monotherapy on Cognitive Impairment in Patients of Epilepsy”. International Journal of Basic & Clinical Pharmacology, vol. 8, no. 4, Mar. 2019, pp. 674-80, doi:10.18203/2319-2003.ijbcp20191098.