Singhal, R. M., Pramod Kumar, and S. D. Sharma. “Study of the Humus Forms in Some Ecosystems of Chakrata Forest (Dehra Dun) U.P., India”. Indian Forester 113, no. 2 (February 1, 1987): 117–126. Accessed December 4, 2025. http://indianforester.co.in/index.php/indianforester/article/view/9340.