Permana, Fendy Hardian, and Lise Chamisijatin. “Project-Based Learning through Edmodo: Improving Critical Thinking and Histology Concepts”. Biosfer: Jurnal Pendidikan Biologi, vol. 12, no. 1, Apr. 2019, pp. 58-69, doi:10.21009/biosferjpb.v12n1.58-69.