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Permatasari, Citra Putri and Yerizon, Yerizon and Arnawa, I Made and Musdi, Edwin (2019) The Development of Learning Instruction Based on Problem Based Learning to Improve Problem Solving Ability of Students in Grade VII (Preliminary Research). International Journal of Scientific dan Technology Research, 8 (8). pp. 600-604. ISSN 2277-8616
Permatasari, Citra Putri (2019) Pengembangan Perangkat Pembelajaran Berbasis Problem Based Learning (PBL) Untuk Meningkatkan Kemampuan Pemecahan Masalah Matematis Peserta Didik SMP Kelas VII. Skripsi thesis, Universitas Negeri Padang.