“Validitas Bahan Ajar Berbasis Project Based Learning Tematik Kelas IV Sekolah Dasar”. At-Thullab : Jurnal Pendidikan Guru Madrasah Ibtidaiyah, vol. 6, no. 2, Oct. 2022, pp. 152-69, https://doi.org/10.30736/atl.v6i2.1085.