CHANDEL, R S, et al. “Direct and Residual Effect of Sulphur on Indian Mustard (Brassica Juncea) in Rice (Oryza Sativa)-Indian Mustard Cropping Systerm*”. The Indian Journal of Agricultural Sciences, vol. 72, no. 4, May 2014, https://epubs.icar.org.in/index.php/IJAgS/article/view/40802.