Hamdani, Muhammad, Baskoro Adi Prayitno, and Puguh Karyanto. 2020. “Demonstration and Experiment on Archaebacteria and Eubacteria: Effectiveness for Cognitive Learning Outcomes (CLO) Based on Critical Thinking Skill”. Biosfer: Jurnal Pendidikan Biologi 13 (1), 75 - 85. https://doi.org/10.21009/biosferjpb.v13n1.75-85.