Harahap, N. F. and 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), pp. 39–52. doi: 10.24114/jh.v14i2.47398.