Nasution, N. S., Chastanti, I., & Harahap, D. A. (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