Harahap, N. F., & Mailani, E. (2023). PENGEMBANGAN E-LKPD BERBASIS QR-CODE MELALUI MODEL PROBLEM BASED LEARNING PADA MATERI BANGUN DATAR DI KELAS IV SEKOLAH DASAR. JURNAL HANDAYANI PGSD FIP UNIMED, 14(2), 39–52. https://doi.org/10.24114/jh.v14i2.47398