Shrestha, Umesh Krishna, and Bijaya Pant. 2012. “Production of Bergenin, an Active Chemical Constituent in the Callus of Bergenia Ciliata (Haw.) Sternb”. Botanica Orientalis: Journal of Plant Science 8 (March):40-44. https://doi.org/10.3126/botor.v8i0.5557.