Singh, Ravindra, and S K Agarwal. 2005. “Effect of Levels of Farmyard Manure and Nitrogen Fertilization on Grain Yield and Use Efficiency of Nutrients in Wheat (Triticurn Aestivum)”. The Indian Journal of Agricultural Sciences 75 (7). https://epubs.icar.org.in/index.php/IJAgS/article/view/9084.