Negi, N. D., and S. K. Upadhyay. “Preliminary Studies on Semi-Hardwood Grafting Technique in Apple under Polyhouse Condition in Mid Hill Area of Himachal Pradesh”. Himachal Journal of Agricultural Research, vol. 41, no. 2, Feb. 2015, pp. 180-3, https://hjar.org/index.php/hjar/article/view/110366.