Supahar, Supahar, Dadan Rosana, Marina Ramadani, and Deby Kurnia Dewi. 2017. “The Instrument for Assessing the Performance of Science Process Skills Based on Nature of Science (NOS)”. Jurnal Cakrawala Pendidikan 36 (3). https://doi.org/10.21831/cp.v36i3.14731.