Kassem, Mohammed, and Zaina Al-Jadeer. 2012. “Study of the Effect of Different Carbon and Nitrogen Sources in the Production of Polysaccharide Xanthan by Xanthomonas Campestris ATCC13951 Bacteria”. Journal of Education and Science 25 (2):58-64. https://doi.org/10.33899/edusj.2012.59149.