NURJANNAH, E.; MARTINI, M.; SUSIYAWATI, E. KETERAMPILAN PEMECAHAN MASALAH MELALUI PENERAPAN MODEL PROBLEM BASED LEARNING BERBASIS SAINS OUTDOOR. PENSA: E-JURNAL PENDIDIKAN SAINS, v. 9, n. 1, p. 29-34, 31 jan. 2021.