Situmorang, H. et al. 2020. PENGARUH REWARD DAN PUNISHMENT TERHADAP HASIL BELAJAR MATEMATIKA SISWA KELAS III SD HKBP . Jurnal Educatio FKIP UNMA. 6, 2 (Nov. 2020), 278–281. DOI:https://doi.org/10.31949/educatio.v6i2.442.