Anirudh P. Singh and M.K. Nautiyal, V.N. (2017) “Spectroscopic Characterization of Humic Acids Extracted From Different Type of Soils of Punjab”, Journal of the Indian Society of Soil Science, 65(1). Available at: https://epubs.icar.org.in/index.php/JISSS/article/view/70251 (Accessed: 6 June 2026).