Sihombing, Alwin, et al. “The Effect of Filler Type and Concentration on the Characteristics of Bioplastics Made from Cassava Starch”. Jurnal BETA (Biosistem Dan Teknik Pertanian), vol. 12, no. 2, Sept. 2024, pp. 1-8, doi:10.24843/JBETA.2024.v12.i02.p23.