Khoiriyah, Miftakhul Janah, et al. “Pengaruh Model Problem Based Learning Terhadap Hasil Belajar Matematika Kelas VIII Materi Bangun Ruang Sisi Datar ”. Didactical Mathematics, vol. 4, no. 2, Oct. 2022, pp. 424-31, doi:10.31949/dm.v4i2.3553.