J. Tindaon and E. Muliani, “PENGARUH PEMBERIAN PENGUATAN (REINFORCEMENT) DI MASA COVID-19 TERHADAP HASIL BELAJAR SISWA KELAS V SD NEGERI 054870 TANJUNG JATI KEC. BINJAI”, JH, vol. 12, no. 2, pp. 48–55, Dec. 2021.