Harahap, A. F. and Nirwana Anas (2026) “Pengaruh Model Project Based Learning (PjBL) terhadap Keterampilan Proses Sains Siswa SD pada Materi Sistem Pencernaan Manusia”, Walada: Journal of Primary Education, 5(2), pp. 1803–1814. doi: 10.61798/wjpe.v5i2.700.