Sharma, N. C., and N. S. Kaith. “Scientific Approach Improves Yield and Quality of Apples: A Success Story of Kotkhai in Shimla District of Himachal Pradesh, India”. International Journal of Economic Plants, vol. 2, no. Feb, 1, Feb. 2015, pp. 032-4, https://ojs.pphouse.org/index.php/IJEP/article/view/4404.