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 (Jun. 2026), 1803–1814. DOI:https://doi.org/10.61798/wjpe.v5i2.700.