Amal A. Almousa, Mohamed N. Abd El-Ghany, and Eman H. Ashour. 2018. “Citric Acid Fermentation by Aspergillus Niger”. Journal of Innovations in Pharmaceutical and Biological Sciences 5 (4):20-37. https://doi.org/10.56511/JIPBS.2018.v5.i04.pp20-37.