Jonsi, Evaristus, and Riyanto Riyanto. 2021. “Hambatan Siswa Kelas VIII Di SMPN 4 Pacar Dalam Mempelajari Mata Pelajaran Biologi Disaat Pandemic Covid-19”. Prosiding Seminar Nasional IKIP Budi Utomo 2 (01), 233-37. https://doi.org/10.33503/prosiding.v2i01.1570.