s, Farah M. “Effect of Soil Extracts on Ability of Clinical Isolates of Pseudomonas Aeruginosa and Staphylococcus Aureus to Produce Biofilm in Vitro”. World Journal of Experimental Biosciences, vol. 5, no. 1, Jan. 2017, pp. 1-4, https://wjebio.com/index.php/journal/article/view/109.