SIDAURUK, M. G. E. ., S. N. . HUTAURUK, M. M. . MARTGRITA, and A. . MANURUNG. “Citric Acid Production From Toba Banana Peel (Musa Acuminata Colla) Through Submerged Fermentation Using Aspergillus Niger”. Microbiology Indonesia, vol. 13, no. 4, May 2020, p. 2, doi:10.5454/mi.13.4.2.