(1)
Purba, S. T.; Rajagukguk, S.; Yana, M. D. ANALISIS KESULITAN BELAJAR SISWA DALAM MEMAHAMI MATERI SISTEM REGULASI MANUSIA DI KELAS XI SMA SWASTA KARTIKA 1-4 PEMATANGSIANTAR TAHUN AJARAN 2020/2021: ANALYSIS OF STUDENTS’ LEARNING DIFFICULTIES IN UNDERSTANDING THE MATERIALS HUMAN REGULATION SYSTEM IN CLASS XI SMA PRIVATE KARTIKA 1-4 ADMINISTRATION FOR THE 2020/2021 ACADEMIC YEAR. JMO 2021, 3, 24-33.