Singh, Joginder, A. Rajasekaran, R. Raina, and R. Rana. “Evaluation of Different Collections of <I>Hypericum perforatum< I> L. In Himachal Pradesh for Biomass Yield and Hypericin Content”. Indian Forester 137, no. 7 (July 1, 2011): 868–871. Accessed December 4, 2025. http://indianforester.co.in/index.php/indianforester/article/view/12872.