Esimone , C. O., and P. O. Oleghe. “Effect Of Preservative Agents On The Microbial Stability Of Some Indigenous Herbal Preparations     ”. The Nigerian Journal of Pharmacy 34, no. 2 (April 1, 2003). Accessed May 17, 2025. https://www.psnnjp.org/index.php/home/article/view/231.