Simanjuntak, S. D., & Imelda, . (2018). Lembar Kertas Kerja Peserta Didik Matematika Kelas 8 SMP Berbasis Budaya Batak Toba Sesuai Kurikulum 2013. Jayapangus Press Books, i–246. Retrieved from http://book.penerbit.org/index.php/JPB/article/view/119