Istiana, R., and M. T. Awaludin. “Enhancing Biology Education Students Ability to Solve Problems in Environmental Science Material through Inquiri Model-Based Lesson Study”. Biosfer: Jurnal Pendidikan Biologi, Vol. 11, no. 1, Apr. 2018, pp. 58-67, doi:10.21009/biosferjpb.11-1.6.