RISTANTI, Eggy Wahyu; BUDIYANTO, Mohammad. UJI COBA EBOOK BERORIENTASI PROBLEM BASED LEARNING DALAM MATERI CAHAYA DAN ALAT OPTIK UNTUK MELATIH KEMAMPUAN BERPIKIR KRITIS. PENSA E-JURNAL: PENDIDIKAN SAINS, [S. l.], v. 9, n. 3, p. 394–398, 2021. DOI: 10.26740/pensa.v9i3.41045. Disponível em: https://ejournal.unesa.ac.id/index.php/pensa/article/view/41045. Acesso em: 16 nov. 2025.