Perwitasari, Urip, et al. “Glucoamylase Production by Aspergillus awamori KT-11 In Solid State Fermentation Using Cassava Peel As Substrate”. Annales Bogorienses, vol. 21, no. 1, June 2017, pp. 21-28, doi:10.14203/ann.bogor.2017.v21.n1.21-28.