Fajarianingtyas, D. A., N. A. Akbar, and H. Herowati. “Developing students’ Worksheet Based on Scientific Approach in Cell As the System of Life”. Biosfer: Jurnal Pendidikan Biologi, Vol. 12, no. 1, Apr. 2019, pp. 109 -21, doi:10.21009/biosferjpb.v12n1.109-121.