Nasution, Novita Sari, Ika Chastanti, dan Dahrul Aman Harahap. 2021. “PROFILE OF STUDENTS DIFFICULTY IN BIOLOGY LEARNING DURING PANDEMIC COVID-19 IN SMA NEGERI 1 SILANGKITANG”. Jurnal Pelita Pendidikan 9 (1). https://doi.org/10.24114/jpp.v9i1.22205.