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Anshori, Thoriq Saiful and , Rita P. Khotimah, S.Si., M.Sc. (2013) Improving Students Independence And Learning Achievement In Mathematics Teaching Through Problem Based Instruction (PBI) On The Topic Of Circle (CAR of Mathematics Learning in Grade VIIIA of SMP Al Islam 1 Surakarta Academic Year 2012/2013). Skripsi thesis, Universitas Muhammadiyah Surakarta.