SIMANJUNTAK, S. D.; IMELDA, . Lembar Kertas Kerja Peserta Didik Matematika Kelas 8 SMP Berbasis Budaya Batak Toba Sesuai Kurikulum 2013. Jayapangus Press Books, [S. l.], p. i–246, 2018. Disponível em: http://book.penerbit.org/index.php/JPB/article/view/119. Acesso em: 30 oct. 2025.