Singh, R. P., and M. K. Gupta. “Vegetation Survey and Ecological Studies under Silver Fir and Spruce Forests of Himachal Pradesh”. Indian Forester 118, no. 7 (July 1, 1992): 460–465. Accessed December 26, 2025. https://indianforester.co.in/index.php/indianforester/article/view/8452.