KUNDU, S, et al. “Utilization of 15 N-Labelled Ammonium and Nitrate-N by Soybean (Glycine Max) and Wheat (Triticum Aestivum) Grown in Typic Haplustert”. The Indian Journal of Agricultural Sciences, vol. 68, no. 11, Feb. 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/27774.