Roy, A., S. Ghosh, M. Chaudhuri, and P. Saha. “Effect of Different Plant Hormones on Callus Induction in <i>Gymnema sylvestris</I> R.Br. (Asclepiadaceae)”. African Journal of Biotechnology, vol. 7, no. 13, Sept. 2010, doi:10.4314/ajb.v7i13.58953.