NURAIDA, Dede; NURIYANTI, Yuyun. VALIDITAS LEMBAR KERJA SISWA (LKS) IPA BERBASIS PROBLEM BASED LEARNING PADA MATERI PENCEMARAN LINGKUNGAN UNTUK SISWA KELAS VII SMP/ MTs. Prosiding SNasPPM, [S. l.], v. 5, n. 2, p. 281–284, 2021. Disponível em: http://prosiding.unirow.ac.id/index.php/SNasPPM/article/view/418. Acesso em: 3 may. 2024.