Chanda, M., S. Jha, D. Mukhopadhyay, and M. Pandey. “Characterization of Humic Acid and Fulvic Acid Extracted from Soil Samples of Cultivated Areas of North Bengal and Sikkim States, India”. Asian Journal of Chemistry 33, no. 1 (December 10, 2020): 62–66. Accessed May 2, 2024. https://asianpubs.org/index.php/ajchem/article/view/33_1_12.