Rahmawati, Dwi Ulan, Jumadi Jumadi, and Eko Mhd Ramadan. 2020. “Developing Physics Learning Tools of Blended Learning Using Schoology With Problem-Based Learning Model”. Jurnal Penelitian & Pengembangan Pendidikan Fisika 6 (2):139-52. https://doi.org/10.21009/1.06201.