Sharma, M. P., and K. Prasad. “Effect of Organic, Inorganic and Integrated Nutrient Management Practices on Soil Health and Productivity of Soybean Based Cropping Systems”. Annals of Agricultural Research, vol. 34, no. 2, Feb. 2014, https://epubs.icar.org.in/index.php/AAR/article/view/37940.