s, Farah M. 2017. “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 (ISSN: 2313-3937) 5 (1): 1-4. https://wjebio.com/index.php/journal/article/view/109.