SINGH, S P, et al. “Influence of Soil Enrichment With Organic and Chemical Sources of Nutrients on Rice (Oryza Sativa) Potato (Solanum Tuberosum) Cropping System*”. The Indian Journal of Agricultural Sciences, vol. 69, no. 5, Jan. 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/26761.