Kaur, K., S. Johar, A. Kumar, M. Jain, P. Kumar, and A. Singh. “A Comparative Study of Intrathecal Bupivacaine and Levobupivacaine for Patients Undergoing Caesarean Section”. International Journal of Advances in Medicine, vol. 6, no. 6, Nov. 2019, pp. 1792-7, doi:10.18203/2349-3933.ijam20195229.