Irdawati, Irdawati, et al. “The Ability of the Thermophilic Bacteria Triculture Consortium from Mudiak Sapan Hot Springs to Produce Biofuel ”. Jurnal Penelitian Pendidikan IPA, vol. 9, no. 4, Apr. 2023, pp. 2265-70, doi:10.29303/jppipa.v9i4.3480.