Indah et al. 2018. The Difference Analytical Ability of Student Learning Assurance, Relevance, Interest, Assessment, Satisfaction with Student Teams-Achievement Divisions on Environmental Pollution. Biosfer: Jurnal Pendidikan Biologi. 8, 2 (Jan. 2018), 39–45. DOI:https://doi.org/10.21009/biosferjpb.8-2.7.