Toy, B. A. I., F. F. Karwur, J. F. da Costa, J. F. Langkun, and F. S. Rondonuwu. “Design of Biology Teaching Materials Based on Discovery Learning With Scientific Approach for Class 10th in Senior High School”. Biosfer: Jurnal Pendidikan Biologi, Vol. 11, no. 1, Apr. 2018, pp. 68-77, doi:10.21009/biosferjpb.11-1.7.