Singhal, R. M., and S. Soni. “Scanning Electron Microsccopy of Soil-Humic Acids of Garhwal Himalayas”. Indian Forester 117, no. 1 (January 1, 1991): 79–83. Accessed February 17, 2026. https://indianforester.co.in/index.php/indianforester/article/view/8572.