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