http://repository.uhamka.ac.id/id/eprint/15003/ Pengaruh Model Problem Based Learning (PBL) Berbasis LKS Terhadap Kemampuan Penalaran Matematis Siswa Pratiwi, Sukma http://repository.uhamka.ac.id/id/eprint/15003/1/FKIP_PENDIDIKAN%20MATEMATIKA_1601105118_SUKMA%20PRATIWI.pdf Unduh!