Deosthale, Y. G., and B. Belavady. “Mineral and Trace Element Composition of Sorghum Grain:Effect of Variety, Location and Application of the Nitrogen Fertilizer”. The Indian Journal of Nutrition and Dietetics, vol. 15, no. 9, Sept. 1978, pp. 302-8, https://www.informaticsjournals.com/index.php/ijnd/article/view/12078.