Panday, S C, et al. “Effect of Tillage and Irrigation on Yield, Profitability, Water Productivity and Soil Health in Rice (Oryza Sativa) -Wheat (Triticum Aestivum) Cropping System in North-West Himalayas”. The Indian Journal of Agricultural Sciences, vol. 78, no. 12, Dec. 2008, https://epubs.icar.org.in/index.php/IJAgS/article/view/9970.