Efektivitas Buku Saku Fisika Berbasis Problem Based Learning (PBL) terhadap Hasil Belajar Siswa. Science and Physics Education Journal (SPEJ, [S. l.], v. 6, n. 1, p. 21–25, 2022. DOI: 10.31539/spej.v6i1.4542. Disponível em: https://journal.ipm2kpe.or.id/index.php/SPEJ/article/view/4542. Acesso em: 11 jan. 2026.