Ezea, I. B., E. Ezaka, J. O. . . Iwuagwu, and C. O. . Itubochi. “Biological Production of Citric Acid in Submerged Culture of Aspergillus Niger Using Cassava Pulp Wastes: Use of A Niger in Production of Citric Acid”. Archives of Ecotoxicology, vol. 3, no. 3, Sept. 2021, pp. 69-74, doi:10.36547/ae.2021.3.3.69-74.