Thapa, C.B., Pant, K.K., Bhattarai, H.D. and Pant, B. 2022. In vitro Induction and Proliferation of Callus in Piper longum L. through Leaf Culture. Nepal Journal of Science and Technology. 21, 1 (Dec. 2022), 13–22. DOI:https://doi.org/10.3126/njst.v21i1.49892.