Choudhary, S.K., A.C. Shivran, G.L. Choudhary, and K. Prajapat. 2014. “Nutrient Uptake, Quality, Water Expanse Components and Economics of Cowpea As Influenced by Fertility Levels and Mulching”. Annals of Agricultural Research 34 (1). https://epubs.icar.org.in/index.php/AAR/article/view/38566.